That giant extinct shark, Megalodon? Maybe it wasn't so mega
Briefly

"As one of the largest carnivores that ever existed," explains Kenshu Shimada, a paleobiologist at DePaul University, "deciphering the biology of Megalodon is critical to understand the role large carnivores play in the context of the evolution of marine ecosystems and how its extinction influenced the development of the present-day ocean."
A research team now suggests the giant shark may have been more slender than scientists thought, according to a new publication in Palaeontologia Electronica. If that's true, it would alter our understanding of how it behaved in its ancient environment and what mark it may have left on the ocean ecosystem of today."
Read at www.npr.org
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