Evolution

The earliest fossil deer including Heteroprox date from the Oligocene of Europe, and resembled the modern muntjacs. Later species were often larger, with more impressive antlers. They rapidly spread to the other continents, even for a time occupying much of northern Africa, where they are now almost wholly absent. Some extinct deer had huge antlers, larger than those of any living species. Examples include Eucladoceros, and the giant deer Megaloceros, whose antlers stretched to 3.5 metres across