91热爆

Tweet of the Day is the voice of birds and our relationship with them, from around the world.

Chris Packham presents a true global ocean going mariner, the red-billed tropicbird. These elegant birds are masters of the winds and tides. There are three species of tropicbirds and all of them nest on tropical islands, spending the rest of the year roaming the open ocean. All are instantly recognisable by their very long whippy central tail-feathers which can be longer than the rest of the bird. With scarlet beaks, black wing-tips and white-tail streamers from a distance they look all-white, but a closer view reveals a narrow black mask. Red-billed Tropicbirds nest on the ground and use their impossibly long tails in courtship displays, moving the feathers to register excitement or aggression. In flight they are graceful soarers and swoopers, and often call a trill chattering rattle in mid-air chases. This sound which resembles a bosun's (boatswain's) whistle, gave rise to their alternative name of 'Bosun Bird'.