Much like humans, many animals line up for a variety of reasons. Rather than forming lines for the school bus or recess, the animals featured in Susan Stockdale's book form lines for

• safety: baby Mallard ducklings follow their mother to the water for their first swim

• warmth: turtles climb into a stacked line for a better share of the sun's rays

• navigation: Arctic wolves follow the prints in the snow left by the pack leader

• food: ants line up to follow the scent of their leader to food and safety

• travel: pink flamingos form a line to reduce wind resistance and fly more efficiently