A. Three gravid adders (Vipera berus) share a site for thermoregulation; B. Juvenile V. berus basking on top of a Grass Snake (Natrix natrix). Two adult adders with a classic (C), melanistic (D) and mixed (E) pattern thermoregulating together. Photographs by Maksymilian Jarmoliński.

  Part of: Zdunek P, Jarmoliński M (2023) Microhabitat sharing for basking between squamate species in Poland. Herpetozoa 36: 65-71. https://doi.org/10.3897/herpetozoa.36.e94064