Figure 2 in Behavioural adjustments enable the colonization of subterranean environments

Figure 2. Representative behaviours considered in this review. A, Proteus anguinus swims fearlessly in groundwater environments. Photograph: Arne Hodalič/Wikimedia Commons/CC BY-SA 3.0. B, The Monte Albo cave salamander, Speleomantes flavus, one of the top predators of Italian caves. Photograph: Gentile Francesco Ficetola. C, Oxichilus draparnaudi, a facultative cave species, is feeding on faeces inside a natural cave. Photograph: Enrico Lunghi. D, aggregative behaviours of harvestmen on a cave wall in Khammouane, Laos. Photograph: Johannes Lundberg.