"Hammer-biter" marsupials were a weird mix of mammal and lizard

The marsupials and monotremes that are now found primarily in Australia represent a sort of evolutionary middle ground, mixing together their mammalian features with those of reptiles or amphibians. One ancient marsupial represents a particularly weird case of convergent evolution. » 4/21/11 4:30pm 4/21/11 4:30pm