The pickle-shaped sea creatures known as pyrosomes are rarely seen along the West Coast, but this year millions of them showed up. No one knows why they're here or how long they'll stay.
You don’t have to delve into the densest rainforest or the deepest ocean trench to discover new species. Chris Marshall finds them in the most familiar places.
Columbia Spotted Frogs require full time water yet find a way to live in the desert.