10-11-2023, 05:56 AM
|
 |
Senior Member
|
|
Join Date: Mar 2017
Location: ABQ, New Mexico
Posts: 36,633
Thanks: 3,506
Thanked 136,555 Times in 22,784 Posts
|
|
It's no secret that sharks are some of the oldest fish in the ocean, but cow sharks are especially old and have remained virtually unchanged for their entire existence, which stretches nearly 200 million years. Unlike most modern sharks, cow sharks have seven gill slits on each side of their body, a characteristic shared with the most ancient progenitors of sharks.
|