A paper clip-sized chameleon and the whale shark are among the threatened ... Other species on the watch list include the Antillean manatee, sometimes referred to as sea cows; the grey-shanked ...

"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 ...