A hummingbird is smaller than your thumb and weighs less than a 20 pence piece - however you measure it, it's tiny. But every spring, hummingbirds that have spent the winter in Mexico fly north to make the most of the warmer weather. They nest as far north as Canada and Alaska; a 2,000 mile trip!
The Snail and the Whale
A snail longs to see the world and hitches a lift on a whale's tail. Together they go on an amazing journey, past icebergs and volcanoes, sharks and penguins, and the snail feels very small in the vastness of the world. But when the whale is beached in a bay, it's the tiny snail who saves the day.