Imagine a world where the boundaries between “fish” and “not-fish” blur, where the ancestors of birds and mammals once swam ...

But biologists with the National Marine Fisheries Service have now discovered the oddball opah’s most distinctive feature: It is the only fish known to ... in birds and mammals, whose stable ...

Myriad mammal ... the earliest known whales in 50-million-year-old deposits in Pakistan. Both had ear bones unique to whales, but the legs and anklebones of artiodactyls. "The first whales ...

The Case Against Marine Mammals in Captivity was first produced in 1995 as a comprehensive resource ... Additional research has led to an expansion of the number of pathogens known to be transmissible ...