“In that time, there have been as many as 5,000 different species. One of the reasons sharks have been so successful is that they’ve exploited different ecosystems and eaten different types of foods.

Prehistoric waters held all kinds of fascinating creatures ... We mostly discover these extinct sharks through their teeth, which they grew in large numbers throughout their lives and which ...

Like human teeth, shark chompers contain collagen ... life of sharks The researchers found that, centuries ago, different types of sharks were feeding on animals that occupied the same level ...

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 ...

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 ...

Cicimurri said that the team employed this method, because shark teeth have different shapes depending on their location in the shark’s mouth. “By studying the jaws and teeth of living sharks, it ...

This “chipmunk shark” packed quite a punch with its strange set of teeth. Its diet varied from ... “We’ve ended up finding at least 70 different kinds of shark at Mammoth Cave from a ...

Instead, minerals in fossilized teeth reveal ... zinc isotopes in the sharks’ tooth enamel preserves a record of the kind of animal matter that they ate. Different types, or isotopes, of zinc ...