The Raptor Education Group, Inc. is actually a wildlife preservation group. They focus on getting injured birds back into the wild. They offer tours of their facilities and other programs on a regular basis. They don't really have a super consistent, set schedule of hours, but they have pretty frequent offerings and regular tour in the summer. If you're interested, chances seem pretty good that you can find something to attend that works in your schedule!
Make sure you check and call ahead!
N2160 W Rollwood Road ~ Antigo, WI ~ (715) 623-2563
Price varies by event; tours are $8 per person, 5&under free