A crucial skill for survival among animals is distinguishing between living and non-living entities, be those predators, social companions, or prey. Animacy is the perceived property of an object to be animate. Therefore, animals should possess fast unlearnt mechanisms for the detection of animacy. If, for instance, primates would rely on learning to avoid venomous snakes, they would probably die at the first encounter. If chicks would imprint on the first object seen immediately after hatching, they would frequently end up imprinting on an eggshell. It is thus likely that selective pressures shaped an adaptive set of unlearnt rudimental knowledge, shared among species. This knowledge helps them to tell apart, in an otherwise undifferentiated sensory world, animate from inanimate objects. Further learning would capitalize on this rudimental, original knowledge and shape more sophisticated cognitive abilities and behaviors (Vallortigara, 2009, 2012b, 2012a; Versace, Martinho-Truswell, Kacelnik, & Vallortigara, 2018). Some configurations of features and movements help animals to disentangle between animate and inanimate objects. The present chapter will thus discuss behavioural evidence and suggested neural mechanisms underlying the detection of static and dynamic cues to animacy in the various species with particular emphasis on their ontogenetic development.