Megalodon may have been up to 80 feet long, but the colossal extinct shark was also probably thinner than scientists previously thought, according to a new study.

Part of the research involved comparing sections of the megalodon's trunk with the trunks of 145 modern and 20 extinct shark species. The largest megalodon fossil ever found is a 36-foot-long (11 ...

Great white sharks, with their thick bodies that grow to about 20 feet long (6 meters), seem to be about as big as a stocky animal can be and still move efficiently through the water. Meanwhile ...