"With estimates ranging from 5.3 to 7.6 tons, the skeleton weighed 2.0–2.9 times as much as that of a 25-meter-long blue whale," the study's authors write. The Perucetus colossus may have looked more ...

blue whale and Florida manatee. Each of these species is already so depleted that the loss of only a few individuals can mean the difference between moving toward recovery or being pushed further ...