Mama Otter won't play, so Joshie sets out on his own; but the other arctic animals are too drowsy to play (like the seal pups) or too busy (like the puffins). When night falls, Joshie hears his mother's song calling him home; next day, she's glad to play. Mama's reason for her day off—which seems more human than otter-like—goes unexplained; still, Joshie's independent foray is nicely shaped, with second glimpses of the same animals (now sleeping) as he swims home, while White's lilting cadence is just right for this lyrical bedtime story. Kuroi (who's illustrated 100 titles in Japan) uses colored pencils for art with almost an airbrush effect; his rounded, pillow-soft forms are organized into pleasing decorative spreads. The animals—especially the round-faced otters—have a slightly cartoonish cast, but that's a small defect in an attractive offering. Carlstrom includes a melodious tune for her three-stanza song. (Picture book. 2-6)