Research overview: directional gain and sound collection by the feline ear

The funnel shape of the cat's pinna collects sound and boosts sensitivity in the direction it faces, providing directional acoustic gain. This overview surveys how the pinna concentrates sound energy toward the ear canal and how aiming it at a source increases the received signal. For faint, distant prey sounds, this gain can make the difference between detection and silence. The survey relates pinna directionality to the cat's habit of orienting its ears toward noises of interest, effectively pointing a biological antenna. It discusses how directional gain works together with localization cues and the mobility of the ear to optimize listening. Framing the pinna as a directional collector explains the practical benefit of a cat's expressive ear movements: they are not merely communicative but actively tune the gain and direction of hearing to capture the quiet sounds that reveal hidden prey or approaching threats.