Prehistoric waters held all kinds of fascinating creatures, including ancient sharks. These sharks typically lived for millions of years, but changes in habitat, lack of prey, and other ...

The researchers found that, centuries ago, different types of sharks were feeding on animals that occupied the same level of the food web—prey that lived near one another and ate similar things.

At different life stages, sand tiger shark teeth change in morphology. The shifting tooth shape might reflect changes in their diet. I am using microtomography (micro-CT) to image the teeth in 3D and ...

to otoliths — inner ear bones — from different kinds of fish, to teeth from marine mammals, plus shark teeth. We could do the same nitrogen isotope analysis and put together the whole story of ...

Mammoth Cave is especially fruitful for these types of discoveries, Toomey said. “We’ve ended up finding at least 70 different kinds of shark at Mammoth Cave from a variety of levels within ...

Various kinds of shark teeth can be found in these places, ... Though most shark teeth are black, some can be different colors, like cream or sand, orange, red, blue or even green, ...