21 Cranes will soon be released into the wild in an effort to reintroduce them into the British countryside. The bird has been absent from Britain for around 400 years with the last known sighting back in 1583. In April a clutch of eggs was shipped in from Germany and hatched at the Slimbridge Wetland Centre in Gloucestershire. The birds have been put through a realistic upbringing programme which has included being taught how to avoid predators. They have now been released into a temporary enclosure and are due to be released into the wild next month. The birds have been fitted with GPS satellite tracking devices so that they can be monitored after release to see how they get on.