Most shark teeth found on beaches are dark, fossilized remains that are thousands to millions of years old. The color of a fossilized shark tooth indicates the minerals present during its formation.

Shark teeth are everywhere once people start noticing them. They turn up in fossil shops, washed along beaches, buried inside ancient rock layers, and occasionally lodged in fishing nets. Yet the ...

Bull sharks (Carcharhinus Leucas) are one of the ocean’s most fearsome creatures. Although some animals may prey on bull sharks, such as crocodiles, killer whales, and the occasional great white shark ...