Belemnites

Belemnites were an extinct group of marine cephalopods related to modern squids and cuttlefish, living approximately 200 to 65 million years ago. They possessed a bullet-shaped internal shell called a rostrum, which helped stabilize their movement in water. Belemnites were active predators, using tentacles to catch prey such as fish and smaller marine organisms. Their fossils are commonly found in sedimentary rocks and are valued by scientists for insights into prehistoric marine environments. Despite being extinct, they left behind well-preserved remains that provide important clues about the Earth's ancient oceans.