A new study showed that mammals in the savanna are more scared of human voices than lions growls. The scientists discovered this by playing sounds from humans, lions, and birds from hidden speakers.

Dogs can be "destabilized" by hearing angry human voices, reveals new research. They may lose their balance - perhaps as the sounds induce emotional arousal, say veterinary scientists. The study ...

Panting after chasing the impala now in its jaws, a leopard drags its prey to a shady spot beside a water hole. Before it can sit down to feast, a voice, seemingly out of nowhere, begins speaking ...