As wise Mama Caribou encourages her stubborn male calf to join the herd's long, seasonal migration north for summer, readers learn facts about caribou and migration.The formula developed in Hush Up and Hibernate! (2018) continues here, using childlike behaviors recognizable to children and adults for Baby Bou and showing in Mama Caribou a parent who gently but firmly nudges her child toward maturity. Mama Caribou initially allows her calf to procrastinate from the upcoming migration: He gets to play with his friends and then dig through snow for a snack of lichens. As Mama counters further excuses, readers learn rudimentary facts about caribou diets, predators, and the migration journey. A funny double-page spread uses the gutter playfully to show Baby Bou's recollections of summer's pesky mosquitoes. The background art of tundra scenery and herds of caribou is realistic and appealing, and it uses varied focusing techniques for distance. However, unlike the bears in the earlier book, this anthropomorphic pair—particularly the calf—has been endowed with spherical eyeballs that often look uncomfortably ready to pop out. Other than that unfortunate choice, there are some excellent facial expressions on both caribou, whose humanlike behaviors will keep readers entertained. As with its predecessor, the text offers a funny and familiar punchline and then several pages of facts related to the migration of temporary tundra-dwellers.Familiar, familial fun delivers facts about caribou. (suggested activity, resources) (Picture book. 3-6)