The sea cow, otherwise known as ‘serenia’, existed 20 million years ago and was discovered within the walls of the Philippines’ Puerto Pricesa Underground River!

The fossils, when discovered, were in near-perfect conditions as you can see by the photo. Something odd found during this discovery was that the sea cow was native to areas in the Mediterranean, Europe, and Africa which makes this fossil even more mysterious!

Scientists are currently researching the river area to see if there are any more remnants from the Miocene Age, where the sea cow was found. 

(Source)