It's spring, and a litter of baby river otters emerges from a den . . . to play! Follow the otters through the seasons as they chase one another, slide down a mudbank, jump in a pile of leaves, and learn to swim. Even while catching fish for their dinner or grooming themselves in the snow, otters love to play -- and Jonathan London's lively text and Meilo So's fluid watercolors invite you to share in the joy.