The raptor rehab program I volunteered with used a lot of donated stuff...we used lab mice who were no longer suitable for research (but only if they'd never been tested with chemicals) as well as a lot of baby chicks and adult layers from the nearby poultry farms and research facilites and some quail from the game farm.

We'd also pick up fresh roadkill squirrels for the eagles...those big boys loved squirrel.

It's definitely a great way to help out!