Tweet of the Day is a series of fascinating stories about our British birds inspired by their calls and songs.
Chris Packham presents the great bustard. Great bustards, one of the heaviest flying birds in the world, were most common in Wiltshire and East Anglia but in the past they were hunted to extinction and the last known breeding birds in the UK were in 1832.
Today, great bustards are back on Salisbury Plain, thanks to the work of the Great Bustard Group. The Group aims to establish a self-sustaining population in the UK.