1. Introducing sharks, skates, rays, and chimaeras -- What are sharks and how are they classified -- How many kinds of sharks are there -- How did sharks get their name -- Where do shards live -- When ...

When we think about sharks, most of us instantly think of the ocean. However, some shark species live in freshwater environments. Some sharks spend their entire lives in freshwater, while others ...

Greenland sharks have hearts that can function normally for more than a century ...

Greenland sharks, the longest-lived vertebrates in the world, show no signs of physical deterioration in their retinas even after living for hundreds of years. The finding is especially surprising as ...