It’s no secret that mule deer face some serious challenges. Habitat loss, climate change, pressure from predators, chronic wasting disease, and a host of other factors are issues for the West’s most ...

The ultra-long-distance migrating mule deer known as Deer 255 has died. Researchers tracked her across 3,300 miles since 2016. Here, she is shown with her twin fawns in a fall 2020 migration stopover ...