Researchers are reporting mass die offs of wild birds and sea mammals due to bird flu. They're tracking the deaths to better understand the virus and how it might create a greater threat to humans.

Researchers are reporting mass die offs of wild birds and sea mammals due to bird flu. They're tracking the deaths to better understand the virus and how it might create a greater threat to humans.

Usually, the salty breeze brought with it the sounds of baby elephant ... to birds of prey — and then to marine mammals from sea lions to dolphins and then, sometimes, jumping back to birds. At Punta ...

Usually, the salty breeze brought with it the sounds of baby elephant seals calling ... and Marcela Uhart take samples from deceased wild animals to test for bird flu. "It's just like wildfire.

Usually, the salty breeze brought with it the sounds of baby elephant seals calling to ... but can sustain itself in wild birds, moving from one flock to the next without burning itself out.