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Prehistoric Hippo Potholes are the First Fossil Mammal Swim Traces
Source info:
| Author: | |
|---|---|
| Date: | 2014-06-12 23:03:26 |
| Blog: | Laelaps  |
| URL: | http://phenomena.nationalgeographic.com/2014/06/12/prehistoric-hippo-potholes-are-the-first-fossil-mammal-swim-traces/ |
Summary:
When Charles Darwin was composing On the Origin of Species, he had to face an extremely frustrating problem. …Content analysis:
Keywords:
Animals, Charles Darwin, extremely frustrating problem, Fossil, Mammal Swim Traces, Origin, Prehistoric Hippo Potholes, Species
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