In this episode we are talking chameleons, one of nature's most famous colour changers. But despite their famous status, very few studies have actually demonstrated that they can change colour under controlled conditions. Research led by our very own Tom Major has shown that flap-necked chameleons from Tanzania are capable of changing their colour, and brightness, to match their surroundings and escape predation.

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Main Paper References:

Major T, Hesten ACM, Stipala J, Cant MA, Stevens M, Troscianko J. 2025 Flap-necked chameleons change colour to match their background. Biology Letters 21: 20250134

Other Mentioned Papers/Studies:

Drown, R. M., Liebl, A. L., & Anderson, C. V. (2022). The functional basis for variable antipredatory behavioral strategies in the chameleon Chamaeleo calyptratus. Journal of Experimental Biology, 225(10), jeb242955.

Stuart-Fox, D., Whiting, M. J., & Moussalli, A. (2006). Camouflage and colour change: antipredator responses to bird and snake predators across multiple populations in a dwarf chameleon. Biological Journal of the Linnean Society, 88(3), 437-446.

Editing and Music:

Intro/outro – Treehouse by Ed Nelson

Species Bi-week theme – Michael Timothy

Other Music – The Passion HiFi, https://www.thepassionhifi.com

The minds of reptiles remain largely mysterious to us, and we often wonder what kind of emotions they are capable of feeling. In this episode we dig into a new study which tries to uncover some of the mysteries of tortoise cognition, particularly whether they can experience different moods. We follow that up with a newly described species of lizard from the rocky deserts of Arabia.

Main Paper References:

Hoehfurtner T, Wilkinson A, Moszuti SA, Burman OHP. 2025. Evidence of mood states in reptiles. Animal Cognition 28. DOI: 10.1007/s10071-025-01973-y.

Species of the Bi-Week:

Šmíd J, Velenská D, Pola L, Tamar K, Busais S, Shobrak M, Almutairi M, Salim AFA, Alsubaie SD, AlGethami RHM, AlGethami AR, Alanazi ASK, Alshammari AM, Egan DM, Ramalho RO, Olson D, Smithson J, Chirio L, Burger M, Van Huyssteen R, Petford MA, Carranza S. 2025. Phylogeny and systematics of Arabian lacertids from the Mesalina guttulata species complex (Squamata, Lacertidae), with the description of a new species. BMC Zoology 10. DOI: 10.1186/s40850-025-00233-3.

Other Mentioned Papers/Studies:

Harding EJ, Paul ES, Mendl M. 2004. Cognitive bias and affective state. Nature 427:312–312. DOI: 10.1038/427312a.

Moszuti SA, Wilkinson A, Burman OHP. 2017. Response to novelty as an indicator of reptile welfare. Applied Animal Behaviour Science 193:98–103. DOI: 10.1016/j.applanim.2017.03.018.

Other Links/Mentions:

Alamshah AL, Marshall BM. 2025. Big bills, small changes: with few exceptions, Jungle crows show minor variation in bill morphology across their distribution. EcoEvoRxiv. DOI: 10.32942/X2NW74. https://ecoevorxiv.org/repository/view/9694/

Editing and Music:

Intro/outro – Treehouse by Ed Nelson

Species Bi-week theme – Michael Timothy

Other Music – The Passion HiFi, https://www.thepassionhifi.com

A monumental new study has addressed the likely impacts of climate change on the activity of desert lizards in Africa and Australia. Hotter temperatures will likely ‘squeeze’ the activity window of some lizards, especially those active during the day. We chat about the ramifications of this paper, before turning to news of dogs being attacked by anacondas.

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Merch: https://www.redbubble.com/people/herphighlights/shop

Full reference list available here: http://www.herphighlights.podbean.com

Main Paper References:

Wild KH, Huey RB, Pianka ER, Clusella-Trullas S, Gilbert AL, Miles DB, Kearney MR. 2025. Climate change and the cost-of-living squeeze in desert lizards. Science 387:303–309. DOI: 10.1126/science.adq4372.

Other Mentioned Papers/Studies:

Starace, F., & Ineich, I. (2025). Predation on dogs by Green Anacondas, Eunectes murinus (Linnaeus, 1758): two cases from French Guiana. Herpetology Notes, 18, 415-419.

Other Links/Mentions:

Rhinella alata call from James LS, O’Mara MT, Touchon JC, Ryan MJ, Bernal XE, Page RA. 2025. The ontogeny of decision-making in an eavesdropping predator. Proceedings of the Royal Society B: Biological Sciences 292:20250450. DOI: 10.1098/rspb.2025.0450.

AmphibiaWeb - Rhinella alata. Available at https://amphibiaweb.org/cgi/amphib_query?where-scientific_name=Rhinella+alata&rel-scientific_name=contains&include_synonymies=Yes (accessed June 19, 2025).

Editing and Music:

Intro/outro – Treehouse by Ed Nelson

Species Bi-week theme – Michael Timothy

Other Music – The Passion HiFi, https://www.thepassionhifi.com