A few tiny fossil teeth have been asked to carry a very large story. Researchers used them to name a new order of marsupials, Keeunamorphia, and to redraw part of Australia’s marsupial family tree.1 Yet the study did not observe one kind of animal becoming another.
Rather, it found small marsupials with working teeth. These teeth had an important function, but their proposed history comes from a model. The team d…
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