Extinct birds. Artwork comparing the size of various extinct birds and dinosaurs compared to a human (far right). From left to right: Gigantoraptor erlianensis (8 metres tall), Dromornis stirtoni (3 metres tall), elephant bird (3 metres tall), giant moa (3.6 metres tall), Argentavis magnificens (8 metre wingspan), Gastornis giganteas(2 metres tall), Osteodontornis orri (6 metre wingspan), Titanis walleri (2.5 metres tall), Haast?ａ?s eagle (3 metre wingspan), Icadyptes salasi (1. 5 metres tall).