The cat is the only feline that purrs when interacting with humans. The sound frequency of cat purring is low; It occurs between 25 and 30 Hz.

The cat that is still with its siblings may purr to get its mother's attention. “It aims to awaken a positive emotion in her to guarantee her food and care,” says João Pedro Monteiro, expert in behavioral medicine at the Faculty of Veterinary Medicine at the Complutense University of Madrid. When a cat purrs at a person, it may have the intention of transmitting several types of messages.