@SusScrofa Yes, those little aviaries were packed with birds and here's the full species list from my 2018 visit. There was a total of 55:
Species list for the outdoor loop (14 species): Bobcat, Red Fox, Raccoon, Woodchuck, Turkey Vulture, Bald Eagle, Red-shouldered Hawk, Red-tailed Hawk, Eastern Screech Owl, Barred Owl, Barn Owl, Great Horned Owl, Black-crowned Night Heron and Herring Gull.
Species list for the indoor area (41 species): Southern Flying Squirrel, Eastern Screech Owl, Northern Saw-whet Owl, Blue Jay, Mourning Dove, Dark-eyed Junco, Gray Catbird, Cedar Waxwing, Rose-breasted Grosbeak, Gray-cheeked Thrush, Swainson's Thrush, Ovenbird, Killdeer, Tennessee Warbler, White-breasted Nuthatch, Common Grackle, American Robin, Red-winged Blackbird, Virginia Rail, Eastern Bluebird, Brown-headed Cowbird, Indigo Bunting, Song Sparrow, Fox Sparrow, White-throated Sparrow, Lincoln's Sparrow, House Finch, Western Fox Snake, Great Plains Rat Snake, Bullsnake, Ornate Box Turtle, Spotted Turtle, Painted Turtle, Common Musk Turtle, Blanding's Turtle, Northern Leopard Frog, American Bullfrog, Eastern Tiger Salamander, Bess Beetle, Pipevine Swallowtail Caterpillar and Chilean Rose Tarantula.
@snowleopard Thank you for the species list! Thats honestly an excellent roster for a small native-focused zoo. I wish more nature centers would keep a larger collection of native songbirds, they can be a great educational tool in highlighting biodiversity in backyards and local parks and are interesting and active animals as well. I see this facility is pretty close to Chicago, I do wonder if any zoochatters from the area have visited more recently?
