For hundreds of thousands of years Great Auks thrived in the icy seas of the North Atlantic, bobbing on the waves, diving for fish and struggling up onto rocky shores to mate and hatch their fluffy chicks. But by 1844, not a single one of these magnificent birds was alive.

In this stunningly illustrated non-fiction picture book, award-winning author and illustrator Jan Thornhill tells the tragic story of these birds that "weighed as much as a sack of potatoes and stood as tall as a preteen's waist." Their demise came about in part because of their anatomy. They could swim swiftly...