You go up to the zoo staff and offer your services. "I'll help you whatever way I can" you say.
The keeper smiles "Really? Well in that case please come with us."
You follow them to a private building where you are suddenly injected and bathed in a strange light. Before you can react you find yourself shrinking inside your clothes. You emerge from a trouser leg, now a large plump rat!
"What have you done with me?!?" you squeak furiously
"You're going to be bait." replies a keeper in a white coat "Don't worry, you'll be perfectly safe. We won't let the bird hurt you, and you'll be turned back - if you agree to our plan, that is."