Yellowstone wildlife watchers cherish spring and early summer as a prime time to see baby animals with their mothers. More than 60 different species of mammals live in Yellowstone and Grand Teton national parks, and they typically give birth in time for their young to take advantage of summer’s bounty.

Late May and early June can be a great time to spot Grand Teton and Yellowstone wildlife caring for their young. But photographers and wildlife watchers should take extra care to avoid getting too close to baby animals. Mothers of all kinds — from bears to birds — will zealously defend their young. Getting too close can stress the babies and prompt an aggressive defense from parents or other members of a group.