Thanks to Clayton Cramer for this story- scientists have discovered the fossil of a beaver-like mammal dating from 164 million years ago. The little creature weighed only 18 ounces but it had a paddle-like tail, webbed feet and fur. It also completely overturns the accepted concepts of mammalian development- proving that mammals had conquered the water 100 million years earlier than previously thought.
Just goes to show that the views of evolution are still evolving.
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