Sharks might not be a natural biological group, with most species potentially closer kin to rays than to an oddball group of sharks.

Based on its whimsical name, it’s easy to assume that the cookiecutter shark is cute and gentle. However, nothing could be further from the truth. In fact, the name “cookiecutter” doesn’t refer to the ...

Biodiversity loss isn’t just about losing species — it’s about losing the evolutionary traits and ecological roles that make those species unique. A new study on requiem sharks (Carcharhinus) shows ...