Pachystruthio
Pachystruthio is a genus of extinct Eurasian bird, which lived in the Late Pliocene to the Early Pleistocene of Georgia and the Crimea. It contains three species, P. pannonicus, P. dmanisensis, and P. transcaucasicus, which were all formerly placed with the ostrich genus, Struthio. P. dmanisensis has been estimated standing 3.5 meters tall and weighing up to 450 kg, making it much larger than the modern ostrich and one of the largest known birds.
Although Pachystruthio is known as the giant ostrich, its relationship to the extant ostriches of the genus Struthio is not clear.
