…and they do adapt to their surroundings!

…and they do adapt to their surroundings!

by Alex Negro Science

The headline isn’t quite right, but it’s close. Scientists from the United Kingdom have recently proven that flap-necked chameleons do indeed adapt their colouring to their surroundings to a certain extent.

To this end, eight subadult Chamaeleo dilepis, which had previously been imported from Tanzania, were subjected to several experiments. The chameleons were placed in a small terrarium sitting on horizontal bars and exposed to different backgrounds: in the first experiment, the backgrounds were yellow, yellow-green, orange and blue-green; in the second experiment, the backgrounds were black and white. And in the third experiment, the backgrounds were decorated with yellow, yellow-green, black or white patterns in different scales (the pattern was originally taken from photos of blackberry bushes from the chameleons’ habitat). A terrarium with a grey background was used as a ‘neutral space’ before the experiments. The animals were photographed repeatedly for 21 minutes during each experiment.

On the yellow background, the chameleons without the predator decoy changed colour most quickly. There was no difference in the speed of colour change between yellow and orange, nor between yellow-green and blue-green backgrounds. The longer the chameleons sat in front of the orange background, the more they adapted to it.

When the chameleons sat on black backgrounds, their colouring also became significantly darker than on grey or white backgrounds. In experiments with differently patterned backgrounds, the scientists found that the chameleons reduced their own colour pattern on green or yellow backgrounds, but hardly at all on white or black patterns – this suggests that the animals are better protected in their natural habitat, especially in green/yellow grass, than on black or white backgrounds.

Of course, the flap-necked chameleons were not able to take on the exact colour of the background like an octopus – this myth remains just that – a myth. However, it would certainly be interesting to know if and when chameleons change their colouring for reasons of communication, camouflage or thermoregulation. So there is still plenty of room for further research.

Flap-necked chameleons change colour to match their background
Tom major, Alexia C.M. Hesten, Jan Stipala, Michael A. Cant, Martin Stevens, Jolyon Triscianko
Biology Letters 21, 2025: 20250134
DOI: 10.1098/rsbl.2025.0134

Flap-necked chameleons in Cabinda (Angola)

Flap-necked chameleons in Cabinda (Angola)

by Alex Negro Verbreitung Science

The province of Cabinda, a 7064 km² area belonging to Angola between the Democratic Republic of the Congo and the Republic of the Congo, is one of the least explored herpetological areas in Africa. The enclave is located around 50 kilometres north of the rest of Angola, directly on the Atlantic coast. Both its enclave status and the difficult accessibility of the existing forest areas have contributed to the fact that little information exists on the local herpetofauna. The Mayombe National Park makes up around a third of Cabinda’s territory. Mayombe is divided into a higher part of the park with rainforest between 500 and 900 metres and a lower part between the Inhuca and Chiloango rivers. This is followed by a coastal plain with valleys and drier vegetation directly on the coast.

During ten expeditions between 2018 and 2024, reptiles and amphibians were searched for on a daily basis. A total of 17 different locations were covered, 10 of which were within Mayombe National Park. Photos were taken of all animals and samples were taken to enable genetic identification.

Chamaeleo dilepis, which is widespread in Angola, was discovered in Mbongo Zimune in Mayombe National Park near the river in a plantation of introduced bamboo. The bamboo plantations are located at around 324 metres above sea level. The species was also found in Nganzi at 107 m in the valleys, where it is more common according to other literature. In the drier coastal areas, where Chamaeleo dilepis is also said to occur frequently, no chameleon could be detected in the present study.

A total of 76 different species were recorded, including 48 amphibian and 28 reptile species. 33 amphibian and reptile species mentioned in earlier literature could not be found again.

Filling the gaps: herpetological checklist of Mayombe National Park and Cabinda Province (Angola) shed light on one of the most unexplored corners of tropical Central Africa
Javier Lobón-Rovira, Ninda L. Baptista, Tyron Clark, Luke Verburgt, Gregory F.M. Jongsma, Werner Conradie, Luis Verissimo, Pedro Vaz Pinto
African Journal of Herpetology 74(1): 1-59
DOI: 10.1080/21564574.2024.2421007

Utilisation of flap-necked chameleons at urban markets in South Africa

Utilisation of flap-necked chameleons at urban markets in South Africa

by Alex Negro Science

Scientists from the African Amphibian Conservation Research Group have analysed the existing literature on the subject. Fortunate M. Phaka also visited six municipal markets in Durban, Johannesburg, Petermaritzburg, Polokwane and Pretoria. At the markets, he searched for amphibians and reptiles sold for medicinal purposes and the names given to them by the vendors. He was able to interview 11 traditional health practitioners in Limpopo, Gauteng and KwaZulu-Natal in detail, from nine of whom he was allowed to take samples of the amphibians and reptiles sold for species identification.

In total, 33 species of reptiles and one species of amphibian used for traditional medicine were identified. Nine of these were found and identified on site during the market visits. The traditional healers interviewed stated that they had either hunted the animal parts themselves, bought them from hunters or taken them from roadkill. Fat and internal organs are removed, the carcasses are rubbed with ash or salt and dried in the sun. Usually, the healers’ customers do not buy complete carcasses, but only small parts of the reptiles on offer. Of the 111 animal samples taken, sufficient DNA to identify the species was obtained from 90 of them. 23% of the samples tested were incorrectly named by the healers.

Chamaeleo dilepis was among the reptile species utilised. No complete chameleon could be found at the markets visited. At the Warwick Muthi Market in KwaZulu-Natal, however, several reptile parts were sampled which, according to DNA comparisons, came from lobed chameleons. Chameleons in general were not identified to species level by the healers. The IsiZulu word unwabu stands for any chameleon.

Barcoding and traditional health practitioner perspectives are informative to monitor and conserve frogs and reptiles traded for traditional medicine in urban South Africa
Fortunate M. Phaka, Edward C. Netherlands, Maarten Van Steenberge, Erik Verheyen, Gontran Sonet, Jean Hugé, Louis H. du Preez, Maarten P.M. Vanhove
Molecular Ecology Resources Vol 25(2), 2025
DOI: 10.1111/1755-0998.13873

The flap-necked chameleon on Serra da Neve (Angola)

The flap-necked chameleon on Serra da Neve (Angola)

by Alex Negro Verbreitung Science

The Serra da Neve inselberg is located in the province of Namibe in south-west Angola on the south-western edge of Africa. At 2489 metres above sea level, it is the second highest mountain in the country. The isolated location in the middle of savannahs makes the inselberg a refuge for biodiversity, but this has so far been poorly researched concerning herps. Scientists from the USA, Portugal and Germany have recently carried out a first survey study to inventory the amphibians and reptiles of the Serra da Neve.

Three expeditions have been carried out since 2016, each lasting a few days. Eight areas were selected to search for animals, including rocky areas as well as forest, open grassland and various altitudes. Pitfall traps, snares, rubber bands and manual searches by day and night were used to find the animals. The individuals found were all killed and prepared for storage and further examination in the museum.

A total of 59 species of reptiles and amphibians were found on the inselberg. Chamaeleo dilepis was found exclusively around the village of Catchi, located at 1590 metres. The village is surrounded by granite rocks and the Miombo forest area, which is dominated by Brachystegia and Julbernardia trees. The flat parts of the plateau surrounding the village are largely deforested. The land is used for grazing cattle or for growing cereals and maize. However, the steep slopes around the village are still forested. A small river also runs through the plateau.

An island in a sea of sand: A first checklist of the herpetofauna of the Serra da Neve inselberg, southwestern Angola
Mariana P. Marques, Diogo Parrinha, Manuel Lopes-Lima, Arthur Tiutenko, Aaron M. Bauer, Luis M. P. Ceríaco
ZooKeys 1201, 2024: pp. 167-217.
DOI: 10.3897/zookeys.1201.120750

Photo: taken from the aforementioned publication

What influences colour patterns in chameleons

What influences colour patterns in chameleons

by Alex Negro Science

Chameleons are known for their ability to change colour. International scientists have now investigated what exactly influences different colour patterns in different populations. They want to know to what extent the habitat itself, the distance to other populations or social interactions influence the colour change.

The test subjects were European chameleons (Chamaeleo chamaeleon) caught in La Herradura and Sanlúcar in Spain. The two regions are around 230 kilometres apart. Other Chamaeleo chameleon were collected in the north-western Negev and on the Carmel coast in Israel (around 180 km apart). On the other hand, flap-necked chameleons (Chamaeleo dilepis) were captured in Simbithi, Zulu Falls and Maduma Boma in South Africa. The three locations are between 100 and 550 kilometres apart.

Each chameleon was subjected to two experiments. In the first, the scientists let the chameleon walk two metres on a horizontal stick, which was placed in the sun about one metre above the ground. In the second experiment, a second chameleon of the same species was placed on the same stick 50 cm away from the first. The colour patterns shown by the animal during the experiments and its behaviour were recorded for 20 minutes. The data was then analysed using computer programs. Blood was taken from a cut claw of all chameleons and genetically analysed. The habitats and soil conditions were also analysed in various ways and statistically evaluated. The captured animals were kept in ventilated plastic cages for a maximum of 12 hours and released after the analyses. Unfortunately, the study does not mention how many chameleons were caught and released in total.

As expected, it turned out that the individual populations of both the European and the flap-necked chameleon differed genetically from each other. The populations of Chamaeleo dilepis had significantly different haplotypes.

In the flap-necked chameleon, the females were significantly larger than the males in two locations, but not in Simbithi. The scientists also found that the colour patterns of the three populations studied could be clearly distinguished from each other. They concluded from the results that the colour patterns in Chamaeleo dilepis are primarily dependent on genetic isolation. The habitat itself and the size of the chameleons did not influence the colour patterns.

In the European chameleon, however, the situation was different: Body size and genetic distance to other populations predicted colour patterns in males very well. However, the colour patterns were independent of the location where the animals were found. Soil or vegetation colours only had a minor influence on the colour of females.

Genetic and behavioural factors affecting interpopulation colour pattern variation in two congeneric chameleon species
Tammy Keren-Rotem, Devon C. Main, Adi Barocas, David Donaire-Barroso, Michal Haddas-Sasson, Carles Vila, Tal Shaharabany, Lior Wolf, Krystal A. Tolley, Eli Geffen
Royal Society Open Science 11: 231554
DOI:  0.1098/rsos.231554