Australia’s weirdest animal just got weirder. The platypus has long spiked curiosity among biologists and those interested in animals. It just doesn’t seem logical that a mammal should exhibit the characteristics of a bird. But this egg-laying, duck-billed beauty plays by its own rules. In fact, there are four other mammals that lay eggs instead of having live births, including the echidna, which looks a lot like a hedgehog, but isn’t.