Capybaras can smell anxiety, and will nuzzle anxious humans instinctively

They are docile prey, and will not hesitate to swim or run away

They are open-air animals, and never make dens. They have intense claustrophobia.

They are an alloparenting species, meaning the females all share in nursing responsibilities.

Capybaras primarily communicate through ultrasonic vocalizations, which is outside the hearing range of most predators, including humans.