The Butterfly Pavilion (Westminster)

Cheyenne Mountain Zoo (Colorado Springs) — feed giraffes in the country’s only mountainside zoo

Colorado Gators Reptile Park (Mosca) — quirky, fun place with a lot to see

Denver Museum of Nature and Science (Denver) — nature dioramas, IMAX 3D Theater, Planetarium, all done well

Denver Zoo (Denver) — Typical big-city zoo, kept up but without a lot of flourishes

Downtown Aquarium (Denver) — sharks, rays, a tiger, the usual stuff—worthwhile on a day when being outside isn’t attractive

May Natural History Museum (Colorado Springs) — vintage exhibit of colorful and unusual insects

Pueblo Zoo (Pueblo) — small but pleasant zoo with a retro vibe.

Wild Animal Sanctuary (Keenesburg) — big cats and bears and such in big cages

CU South Denver Museum (Parker) — University of Colorado wildlife museum—not large, but fun do see.