Why are there so many species of beetles and so few crocodiles?

There are more than 400,000 species of beetles and only two species of the tuatara, a reptile cousin of snakes and lizards that lives in New Zealand. Crocodiles and alligators, while nearly 250 million years old, have diversified ...

Study suggests new method of identifying native species

(PhysOrg.com) -- A radically new way to determine whether an introduced species has become a native species - by observing the reactions of other local species - is outlined in research by the University of Sydney, using ...