Ostriches are today's largest birds, but in the past - even these giants would have seemed relatively miniature.
Palaeontologists have unearthed what is thought to be the leg bones of the largest species of bird to ever live.
'Terror in the Skies' will explore stories of strange winged creatures in the US including the legendary Mothman.
Legends of a huge bird have been an integral part of American Midwest culture for centuries.
Cryptozoologist Karl Shuker looks back at a case from 1998 in which he received information from a University Professor ...