I believe they are a rehab facility, so animals are released when/if well. Last time I went, it looked like some improvements had been made. (Used to go annually when I taught summer school.)

I could be wrong, though.

Go to Maine Wildlife Park (formerly known as 'Gray Animal Farm'):
https://www.maine.gov/ifw/wildlife-park/index.html

This book prompted me to change many things in my life.