Make Way for Ducklings by Robert McCloskey, 1941.

Mr. and Mrs. Mallard are looking for a new home where they can raise their babies.  After trying several places, they finally find a place that seems right on an island in the Charles River, not far from the Public Garden where people fed them peanuts.

Then, one day, Mr. Mallard decides to take a trip to explore the river, leaving Mrs. Mallard and their ducklings on the island.  The two of them agree to meet again with their ducklings in the Public Garden in a week.  However, the journey from the river to the garden is perilous.  Mrs. Mallard and her ducklings need the help of some friendly policemen to make it safely through the city!

The classic children’s picture book is cute and gentle with a happy ending for the Mallard family. This book is a Caldecott Medal winner and the Official State Children’s Book of Massachusetts.

The book is available to borrow and read for free online through Internet Archive (multiple copies).