Tweet of the Day is a series of fascinating stories about our British birds inspired by their calls and songs. Steve Backshall presents the little tern.
Little terns are our smallest terns. You can pick them out from our other terns by their smaller size, white forehead and yellow bill with a black tip. They look flimsy and delicate but move too close to one of their colonies, and you'll unleash a tirade of grating shrieks as they try to intimidate you out of their territory.