Tattletale

RAT

This small, often unwelcome creature might squeak when cornered and is known for betrayal in both human and animal worlds.

"Tattletale" hints at someone who snitches or betrays secrets, which is why "RAT" fits as the answer. In slang, a rat is an informant or someone who reveals confidential information, often to authorities. The clue plays on that double meaning—both the literal animal and the figurative traitor. It’s a straightforward pun relying on common slang rather than tricky wordplay.