A wet, cold preview of winter has brought an end to this year's wolf recovery efforts at Isle Royale National Park, where four wolves have been relocated this fall.

We often talk about monitoring Yellowstone. To most people, this implies tracking earthquake activity over time, or how the ground moves up and down, or how temperatures change due to thermal activity. But did you know that the river systems are also monitored? It turns out that tracking changes in river chemistry is a good way to identify overall changes in Yellowstone's hydrothermal system.

An altercation between a law enforcement ranger and an individual at Grand Canyon National Park early Thursday led to the ranger firing a shot at the suspect, who wasn't hit by the shot but did sustain minor injuries in the scuffle.

Wildlife biologists have good news to report about one of the world’s rarest fishes. Scientists recently counted 187 Devils Hole pupfish, which is the most they’ve observed in 15 years.