After the last of the dinosaurs died out, 60 million years ago, and before humans evolved a million years ago, the Earth was ruled by mammals and birds. Some of these reached extraordinary sizes. There were giant, hornless rhinoceroses with long, giraffe-like necks; and 2 metres high flightless, meat-eating birds, such as Diatryma, with its ripping beak. | | Diatryma, a giant meat-eating bird from ancient America |
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