It was a fierce predator, "not a dinosaur you'd want to mess with," said the scientist whose analysis of an ancient skull revealed a brand new species.
A predicted global warming effect is a slowdown in North Atlantic Ocean circulation. New research shows recent decreases that are unprecedented in the past 1,100 years.
It circulates heated blood through its body as mammals and birds do. Its warm blood makes the opah a high-performance predator that swims faster, sees better.
In close-up images via the orbiting Rosetta spacecraft, the rock looks poised like a ballerina, with only a tiny fraction of its surface touching the ground.