Out of 337 manatee carcasses recovered in Florida last year, 101 were very young calves, compared to the 59 dead calves found in 2007. Though reasons for this increase are unknown, more manatees are also dying from boat collisions—90 perished as a result last year, compared to 73 the year before. Recent studies point to the manatees’ inability to hear boats, instead of their innate slowness, as previously thought. Scientists have discovered that manatees aren’t even slow to begin with.