The resulting fossils now provide evidence that there really may have been an Age of Monotremes, before other mammals came to dominate. "It's like discovering a whole new civilization," says ...

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Among the many unusual features of monotremes, one is their position in the tree of life: they separated from other mammals very early, making them the oldest branch in the mammalian tree.

Six monotremes living in the same place at the same time, 100 million years ago at Lightning Ridge, NSW. Clockwise from lower left: Opalios splendens, a newly described species dubbed an ...