Zebra finches amazing at unmasking the bird behind the song: The spirited songbirds can rapidly memorize the signature sounds of at least 50 different members of their flock 

Like humans who can instantly tell which friend or relative is calling by the timbre of the person’s voice, zebra finches have a near-human capacity for language mapping.

Source: Zebra finches amazing at unmasking the bird behind the song: The spirited songbirds can rapidly memorize the signature sounds of at least 50 different members of their flock — ScienceDaily