This Ancient Sea Cow Was Killed by a Croc and Eaten by a Shark
Briefly

The discovery of the Culebratherium fossil reveals a troubling picture of predator-prey interactions millions of years ago, revealing bite marks from both a crocodilian and a shark.
The fossil's poorly preserved condition, however, didn't diminish its significance, as bite marks from a shark and a crocodile indicate the complex ecological interactions in ancient times.
Read at www.scientificamerican.com
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