Rights: 123RFRachael Sowerby, Sirtrack Published 14 April 2009 Size: 140 KB

The ostrich, rhea, cassowary and kiwi are all related birds that had a common ancestor in Gondwana. They are now distributed across New Zealand, South America, South Africa and Australia.

(Top left to right clockwise: Ostrich, rhea, kiwi and cassowary.)