Presentation in Munster about Madagascar’s chameleons

The DGHT Münster is also starting the new year with lots of chameleons. On Friday, 16 January 2026, Philip-Sebastian Gehring will give a detailed lecture on Madagascar and its many chameleons.

Madagascar is home to almost half of all known chameleon species worldwide, all of which are found exclusively on this island. This extraordinary diversity makes Madagascar’s chameleons an important subject of scientific research, as they offer unique insights into the mechanisms of evolution and adaptation. Over the past 20 years, numerous studies and new discoveries have significantly expanded our understanding of species diversity and evolutionary processes within this group of reptiles. In particular, the identification and description of new species and the investigation of their genetic differences have provided key insights into the origin and differentiation of species. The lecture will provide a comprehensive overview of this research and clearly present the current state of research on Madagascan chameleons.

Dr. Philip-Sebastian Gehring Evolution and diversity of Madagascar’s chameleons – Latest research findings [German]
DGHT city group Munster
Zoo school of Allwetterzoo Munster
Sentruper Straße 315
48161 Münster
Lecture begins at 7 p.m., doors open at 6:30 p.m. via the main entrance of the zoo.

Photos: small Calumma species in Madagascar, photographed by Philip-Sebastian Gehring

Presentation in Frankfurt about Madagascar

by Alex Negro Reiseberichte Live lectures Science

The DGHT Frankfurt is kicking off the new year with a highlight. Thanks to a visit home, they are fortunate to welcome Rainer Dolch from the Association Mitsinjo in Andasibe, Madagascar. On Friday, 9 January 2026, he will give a detailed lecture on Madagascar and its herpetological diversity.

Madagascar’s amphibians and reptiles inhabit a wide variety of habitats, from lowland forests to the highest mountain peaks, karst areas, dry forests and unique semi-deserts. Madagascar’s long isolation after the break-up of the supercontinent Gondwana, its geography and the enormous diversity of its habitats have promoted evolutionary processes that have produced numerous endemic species of amphibians and reptiles. Many of these taxa are allopatric and microendemic, meaning they are restricted to very small, confined areas. Endemic families such as the Madagascar frogs (Mantellidae), the Madagascar snakes (Pseudoxyrhophiidae) and the Madagascar iguanas (Opluridae) have each undergone major radiation. A wide variety of legless skinks and some of the world’s rarest turtles also belong to the island’s extraordinary herpetofauna. Finally, Madagascar is a hotspot for chameleon diversity. In the chameleon genus Calumma in particular, many cryptic species have only recently been described which, although they look almost identical externally, are genetically so different that they can no longer reproduce with each other. Many of the amphibians and reptiles native to Madagascar and the habitats they inhabit are presented, as are the threats they face and measures taken to protect them.

Dr. Rainer Dolch Microendemism, cryptic species, fascinating diversity: a tour d’horizon through the herpetofauna of Madagascar [German]
DGHT city group Frankfurt
Zoo school of Frankfurt zoo
Bernhard-Grzimek-Allee 1
60316 Frankfurt am Main

Lecture begins at 7 p.m., doors open at 6:30 p.m. via the exit gate at the main entrance on Alfred-Brehm-Platz (gate between the zoo shop and the zoo society building).

Photos: Herpetological diversity of Madagascar, photographed by Rainer Dolch

Calumma species in three highland forests of Madagascar

by Alex Negro Science

Biologists from the University of Antananarivo recently investigated how different habitats affect the presence of four Calumma species in Madagascar. They chose the Ambohitantely Special Reserve, managed by Madagascar National Parks, and two forests in the Anjozorobe-Angavo corridor as their study areas: Anorana, not officially declared a protected area and managed by local communities, and Antsahabe, managed by the NGO Fanamby. The three study areas covered a wide variety of forest types, from intact rainforest to forest fragments with mainly young trees, including areas that had been cleared by burning. All three areas are located in the northern highlands of Madagascar.

During the dry and rainy seasons of two years, biologists searched for chameleons along 50-metre-long transects (14 transects per location, each with three parallel lines). The searches were carried out in pairs at night using torches. Each chameleon found was identified, measured and various data on the location of the find was recorded. In addition, 16 botanical transects, each 100 m long, were used to collect data on the surrounding habitat.

The results of individual transects had to be removed from the evaluation because slash-and-burn farming had taken place in their vicinity shortly before the search nights and an impact on the animals could not be ruled out. A total of 32 transects could still be evaluated.

Basically, Calumma gastrotaenia, Calumma globifer, Calumma crypticum and chameleons of the Calumma nasutum group were found in all three study areas. Calumma gastrotaenia was by far the most frequently discovered species. As expected, significantly more chameleons were discovered during the rainy season than during the dry season, including more hatchlings in particular. At all three locations, more females than males were found in all seasons. More chameleons were found in undisturbed, intact rainforest than in destroyed areas. In addition to the Calumma species sought, Brookesia ramanantsoai, Brookesia thieli and Furcifer willsii were also discovered.

No differences in the preferred height of sleeping places were found between the rainy and dry seasons. Overall, the chameleons used a very wide range of vegetation for sleeping. Hatchlings and juveniles generally used narrower and higher sleeping places than adult chameleons.

The highest population density of Calumma globifer was found in Anorana, with 88 individuals per hectare. On average, the animals of this species slept at heights between 0.5 and 5 m, with almost 40% sitting on lianas. Juveniles were occasionally found on bamboo, dragon trees (Dracaena ssp.) and stone pines (Podocarpus madagascariensis). Calumma gastrotaenia and Calumma globifer preferred habitats with large trees and denser vegetation between 2 and 4 m in height. Calumma globifer mainly inhabited habitats with a closed canopy.

The highest population density of Calumma gastrotaenia was found in Ambohitantely with 60 individuals per hectare. The species was mainly found in undergrowth with bamboo, ferns, plants with elongated leaves and grasses. It was noticeable that over 30% of the roosting sites were bamboo. Overall, the species seemed to cope better than the others with destroyed habitat.

The highest population density of the Calumma nasutum group was found in Ambohitantely, with 61 individuals per hectare. They were also relatively common during the dry season in Ambohitantely and Antsahabe. The species preferred the ends of small, thin branches and climbing plants for sleeping. They usually sat at a height of between 0.3 and 6 m. More than half of the animals found in the Calumma nasutum group were on the branches of shrubs and leaves, while the other half were found on lianas and climbing bamboo (Nastus ssp.).

In contrast to the other species, Calumma crypticum showed a much lower population density in the forests studied, with a maximum of 9 individuals per hectare in Antsahabe. Calumma crypticum was the only species found higher during the rainy season than during the dry season, at an average of 4 to 6 m. However, the species also showed a high variation in the height of its roosting places, with one chameleon discovered at a height of only 0.5 m. The species preferred thicker branches in particular. Both Calumma crypticum and chameleons of the Calumma nasutum group preferred open habitats that were nevertheless rich in branches. It remains unclear whether the seven Calumma brevicorne found in the entire study area can actually be attributed to this species or whether these are individuals that do not match the original description, which is almost 150 years old.

Ultimately, it was confirmed that the vegetation structure of a habitat has a significant influence on the population density of the Calumma species studied. The habitat described by the scientists as most suitable for Calumma species was found in the forests of Antsahabe and Anorana, both located in the Anjozorobe-Angavo corridor. The latter also had the highest total number of Calumma gastrotaenia and Calumma globifer. The Ambohitantely reserve, on the other hand, was notable mainly for its heavily destroyed forest area. In just two years during the study, several large fires following slash-and-burn practices had led to massive tree loss. Ambohitantely is the place where Calumma crypticum was first described – yet this species was the least represented in the study areas.

Habitat use, selection, and population density of chameleon communities (Calumma spp.) in the fragmented central highland forests of Madagascar
Fandresena Raktoroarimalala, Arianna L. Kuhn, Achille P. Raselimanana, A. Tahinarivovny Jacquis, Sara Ruane
MBC Ecology and Evolution 25: 137.
DOI: 10.1186/s12862-025-02479-4
Kostenloser Download des Artikels

Picture: Calumma globifer in Maintsoanala, photographed by Alex Negro

The optic nerve of chameleons is highly specialised

by Alex Negro Tiermedizin Science

It has long been known that chameleons have very special eyes. What is particularly fascinating is that they can move their eyes independently of each other in almost any direction. A team of US scientists has now discovered that the optic nerve in chameleons is also extremely specialised.

They examined adult reptiles of 34 different species using CT models. Brookesia superciliaris, Rieppeleon brevicaudatus and Chamaeleo calyptratus represented the chameleon family. They found that in all three chameleon species, the optic nerve was extremely curled. This anatomical feature means that the optic nerve in chameleons is much longer than would be necessary for an eye looking straight ahead. It probably enables the animals to have extremely mobile eyes without compromising their vision. Put simply, the optic nerve functions a bit like a flexi leash: when the eye moves sharply, part of the optic nerve is ‘unrolled’. When the eye moves back, the optic nerve curls back to its original position without overstretching the nerve fibres.

A new twist in the evolution of chameleons uncovers an extremely specialized optic nerve morphology
Emily Collins, Aaron M. Bauer, Raul E. Diaz Junior, Alexandra Herrera-Martínez, Esteban Lavilla, Edward L. Stanley, Monte L. Thies, Juan D. Daza
Scientific Reports 15, 2025: 38270.
DOI: 10.1038/s41598-025-20357-3
Download the article for free

Photo: Portrait of Brookesia superciliaris, photographed by Alex Negro

First digital atlas of the head anatomy of the veiled chameleon

by Alex Negro Tiermedizin Science

The anatomy of chameleons has been discussed in many publications, primarily older ones. Scientists at University College London (UK), in collaboration with Belgian, French and Swiss colleagues, have now created the first digital atlas of the head anatomy of the Veiled chameleon (Chamaeleo calyptratus).

To do this, they performed micro-CT scans of two dead adult Chamaeleo calyptratus specimens preserved in ethanol. One male and one female were examined. A few weeks later, they repeated the CT scans using special stains. The skulls of both chameleons were then digitally reconstructed using various programmes, including Dragonfly 3D World and UNet3D. Bone parts, muscles and other soft tissue were distinguished and named. In addition, estimates of muscle strength, bite force, muscle volume and muscle length were made.

As expected, the authors found that the male veiled chameleon differed from the female primarily in terms of its facial skull and higher casque. The muscle responsible for moving the lower jaw is significantly larger in males than in females. All of the micro-CT scans can be viewed here free of charge.

3D anatomical atlas of the heads of male and female adult Chamaeleo calyptratus
Alice Leavey, Eloy Gálvez-López, Anthony Herrel, Laura B. Porro
The Anatomical Record, 2025: 1-33.
DOI: 10.1002/ar.70077
Download the article for free

Graphic: Colour representation of the various bone parts of the skull and lower jaw of the veiled chameleon

Do different ecomorphs use different perches?

by Alex Negro Science

South African scientists have investigated whether the physique of a dwarf chameleon affects the branches it prefers to use. In South Africa, three different ectomorphs, or body types, are known among dwarf chameleons of the genus Bradypodion: First, there is the forest ecomorph. This ecomorph is found in closed canopy forests, is large with a long tail, but relatively gracile. Typical for the forest ecomorph are bright colours and conspicuous gular and and casque ornamentations. The second ecomorph is the ‘small brown chameleon’, which occurs in open habitats such as heathland, grass savannah or fynbos. As the name suggests, this type of chameleon is small, inconspicuous brown or greenish in colour and has reduced gular and casque ornamentation. The third ecomorph is the bushland ecomorph: chameleons in bushland or thickets that are large but generally rather heavy-bodied and short-tailed, rather inconspicuous in colour, but with conspicuous gular and casque ornamentation.

The scientists measured the diameter and angle of the branches used by different Bradypodion species. The following species were among the test subjects: B. barabtulum, B. baviaanense, B. caffrum, B. damaranum, B. ketanicum, B. melanocephalum, B. occidentale, B. pumilum, B. setaroi, B. taeniabronchum, B. thamnobates, B. transvaalense and B. ventrale, as well as the three candidate species ‘emerald’, “groendal” and ‘karkloof’. Chameleons from 38 different populations across South Africa were measured at night and sorted into one of the three body types mentioned above. In addition, branch diameters and angles were measured every 10 metres along randomly selected 100-metre-long transects within a radius of one metre.

The data was then statistically evaluated. Between 2007 and 2024, a total of 1,755 adult Bradypodion and their branches were measured. The forest ecomorph chameleons had access to a much greater variety of suitable branches in terms of diameter and angle than in the other two habitats. The chameleons did not show a preference for certain branches in the forest, but rather ‘used what was available’. The habitat of the ‘small brown chameleons’, on the other hand, had significantly more vertical, thinner branches than the forest, but these had a similar angle. The density of branches was highest in this habitat. However, the ‘small brown chameleons’ chose vertical and usually thicker branches significantly less often than would have been available in their habitat. In the shrubland, the scientists found more vertical and thinner branches than in the forest, and in terms of number, the branches did not differ from the open habitat such as fynbos, but differed in branch diameter. The shrubland ecomorph was larger than those ecomorphs of the other two habitats. It was noticeable that the female shrubland chameleons preferred to use thicker branches and also preferred fewer vertical branches than were available.

The study shows that different ectomorphs of dwarf chameleons in South Africa do indeed occupy different habitat structures.

Comparing perch availability and perch use between African dwarf chameleon (Bradypodion) ecomorphs
Jody M. Barends, Melissa A. Petford, Krystal A. Tolley
Current Zoology 71(5), 2025: 633-644
DOI: 10.1093/cz/zoae076
Free download of the article

Graphic: The three different ecomorphs, from the above-mentioned publication

New distribution data of Rieppeleon brachyurus in Mozambique

by Alex Negro Beobachtungen Verbreitung Science

Rieppeleon brachyurus is a small stump-tailed chameleon species, first described at the end of the 19th century from the Shire Highlands south of Lake Malawi. The species has since been found in Malawi, Tanzania and Mozambique. In Mozambique, it was previously known from rainforests and gallery forests, known as miombo forests. Miombo forests are very open dry forests with sparse grass cover, giving them a savannah-like appearance (hence the term ‘forest savannah’). The Zambezi River, which runs across Mozambique, was previously considered the natural boundary for the occurrence of Rieppeleon brachyurus.

Herpetologists have now discovered that the species also occurs south of the river. They found two juvenile individuals and two adult females of the species in Coutada 11, a 5000 km² hunting concession in the heart of Mozambique. The animals were found there in a sand forest, a rare type of tropical forest on sand dunes, right next to a shallow wetland. These observations extend the previously known range of the species by about 250 km further south.

The authors also report two further new locations where Rieppeleon brachyurus has been found, in Taratibu and Montepuez Rubi Mining Concession, both of which are located north of the Zambezi River. In both observations, the ground chameleons were found in miombo forest at altitudes between 250 and 400 m.

Rieppeleon brachyurus (Günther, 1893) Beardless Pygmy Chameleon First records south of the Zambezi River
W. Conradie, D. Botma, C. Nanvonnamuquitxo
African Herp News 88, 2025: 28-33
DOI: not available
Free download of the article

Photo: Juvenile Rieppeleon brachyurus in Mozambique, photographed by Delport Botma, from the above-mentioned publication

Two “new old” chameleon species from Madagascar

by Alex Negro Neubeschreibungen Science

It has long been known that Calumma gallus from eastern Madagascar is not just one species, but rather an entire species complex. Scientists have now taken a closer look at the complex and conducted new genetic studies – completely overturning some species classifications in the process.

The short version:

What was previously thought to be Calumma nasutum from Andasibe, Anosibe An’Ala and Tarzanville is now called Calumma hofreiteri. The females still cannot be reliably distinguished from Calumma emelinae. The ‘real’ Calumma nasutum occurs in rainforests near Ranomafana and Mananjary. The males of Calumma nasutum have a significantly larger rostral appendage, which is often yellow in colour, while the females only have a red snub nose. Calumma nasutum belongs to the gallus complex.

What was previously thought to be Calumma gallus and occurs in the Vohimana reserve and surrounding area is now called Calumma pinocchio. The ‘real’ Calumma gallus occurs in a forest fragment near Tarzanville, in Tsinjoarivo and several small areas near Toamasina on the east coast of Madagascar. Its rostral appendage is serrated at the top, while the rostral appendage of Calumma pinocchio is smooth.

Towards a revision of the Malagasy chameleons of the Calumma gallus complex: Redefinition of Calumma nasutum based on a museomics approach and descriptions of two new species
Frank Glaw, Stefanie Agne, David Prötzel, Philip-Sebastian Gehring, Jörn Köhler, Michaela Preick, Fanomezana M. Ratsoavina, Nicolas Straube, Katharina Wollenberg Valero, Angelica Crottini, Miguel Vences
Salamandra 61(4): 442-466, 2025.
DOI: not available
Free download of the article

Photo: from the above publication, Calumma nasutum

Cape dwarf chameleons are ambush predators

by Alex Negro Beobachtungen Science

For a long time, only two types of foraging behaviour were distinguished: active foragers and sit-and-wait or ambush foragers. Many years ago, two publications classified chameleons as ‘cruise foragers’, i.e. hunters that move slowly through the bushes, stop to feed and then move on. A study from South Africa is now investigating whether this is true and whether other factors contribute to movement. In order to evaluate the mode of foraging, one would actually have to ‘factor out’ movement for regulating body temperature, evading predators or opponents, searching for females or mate guarding.

To this end, 38 tagged (12 of them radio-tagged) Bradypodion pumilum were tracked over 10 days in April and 10 days in February. The chameleons live in Brümmer Park in Stellenbosch in the Western Cape province. They were divided into 17 male, 19 female and 2 indeterminate Bradypodion pumilum. The animals were located every evening and every morning on the specified days using telemetry and the naked eye. Each chameleon was observed for 60 to 180 minutes at a time, with two to four observers using binoculars from a distance of 5 to 10 metres from the chameleon being observed. The researchers recorded movements and stationary behaviour and assigned the corresponding motivation to each movement, noting food intake and number of shots.

A total of 171 hours of observation time was accumulated. Bradypodion pumilum spent most of the day (over 75%) stationary on their branches in Brümmer Park. In the morning, over 80% of them were sitting around, with almost half of this time spent sunbathing, presumably to warm up, and the other half spent stationary in shady vegetation. During the observation period, 26 Bradypodion pumilum fed a total of 110 times. They ate significantly more often (over 80%) when they were not moving. A strong factor for movement was interaction with conspecifics – during the observations, one male was even chased away by a female, causing it to fall from the tree.

The authors conclude from their study that Bradypodion pumilum is more likely to be a ambush hunter.

A multi-index approach to assessing foraging mode: a case study using chameleons
Wade K. Stanton-Jones, Krystal A. Tolley, Jody M. Barends, Graham J. Alexander
Current Zoology, 2025, zoaf065
DOI: 10.1093/cz/zoaf065
Free article download

Photo: Bradypodion pumilum tagged with a transmitter from the study mentioned above

Presentation in Frankfurt about Ethiopia

by Alex Negro Reiseberichte Live lectures Science

On Friday, 26 September 2025, herpetologist Dr Arthur Tiutenko from Friedrich-Alexander University Erlangen-Nuremberg will give a lecture accompanied by numerous images about a very special forest in Ethiopia.

The Harenna Forest, which stretches along the southern slopes of the Bale Mountains in southern Ethiopia, is one of the last remaining forest areas in the Horn of Africa and the largest remaining rainforest on the African mainland. It is not only home to Arabica coffee, but also to numerous other endemic plant and animal species, many of which have not yet been scientifically discovered and described. The herpetofauna of the Harenna Forest includes more than 40 species, including the two large Ethiopian vipers – Bitis harenna and Bitis parviocula. The habitats of these animals and the entire ecosystem are being destroyed by overpopulation and increasing economic exploitation. Even the future of the officially protected parts of the forest looks bleak. This makes it all the more important to gain knowledge about the species that still live in the forest before it is too late. Arthur Tiutenko has explored the Harenna Forest in ten expeditions, the results of which he reports on in this lecture.

Dr. Arthur Tiutenko Harenna Forest, Ethiopia – 12 years of expeditions into the last rainforest in the Horn of Africa [German]
DGHT Stadtgruppe Frankfurt
Zoo school of Zoo Frankfurt
Bernhard-Grzimek-Allee 1
60316 Frankfurt am Main
Lecture begins at 7 p.m., doors open at 6:30 p.m. via the exit gate at the main entrance on Alfred-Brehm-Platz (gate between the zoo shop and the zoo society building).

Photo: Trioceros balebicornutus, photographed by Arthur Tiutenko on one of his travels

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