Even if they weren’t sensitive species, wouldn’t you still love the wolverine for its ferocity, the sage grouse for its elaborate courtship displays, the Canada lynx for its air of mystery and the boreal toad its toxic secretions? OK, maybe three out of four?

So in honor of Endangered Species Day on Friday, May 18, here are four “other” fascinating and compelling Grand Teton and Yellowstone animals you might want to know more about. Though none of these animals is technically listed as endangered, they each are closely tracked by researchers for a variety of reasons.