TaeKwonDood writes: "Is it reptile, bird or mammal? Some of each. Does it have venom, lay eggs and lactate? Yes. Upon discovery in 1798, fellow scientists thought it was for an episode of "Thou hast been Punk'd" but this Australia native, on home on land and in water, is real and, finally, it gets its own decoded genome. It's no surprise the DNA is as messed up as the critter itself."