Agent B-17

A CONTROL bird, a parrot, sent to infiltrate the Washington Animal Spa along with Fang because it will be able to repeat whatever it hears.

Unfortunately, B-17 does just that; revealing to the KAOS agents that pet owner Stanley Maxwell is actually CONTROL agent Maxwell Smart.

During the mission, 99 calls the parrot "Polly". Given that Fang is operating undercover using his real name, it is possible that this is the bird's real name also.

[Episode #23: "I'm Only Human".]