Researchers from the Max Planck Institute for Evolutionary Anthropology and elsewhere have looked at zinc isotopes found in the teeth of extanct wild and aquarium sharks and compared them to the teeth of extinct megatooth sharks. Otodus megalodon. Image credit: Karen Carr / CC BY 3.0. The trophic level of animals indicates their position within an ecosystem, and diet plays an important role in understanding an animal’s lifestyle and ecology. Zinc...
