Background: Climate plays a key role in the life histories of tropical vertebrates. However,
tropical forests are only weakly seasonal compared with temperate and boreal regions. For
species with limited ability to control core body temperature, even mild climatic variation can
determine major behavioural outcomes, such as foraging and predator avoidance. In
tropical forests, sloths are the arboreal vertebrate attaining the greatest biomass density, but
their capacity to regulate body temperature is limited, relying on behavioural adaptations to …