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 ...

One early summer day in 2018, in the southern end of the Wyoming Range, a mule deer doe told her 1-year-old fawn to scram. The young one did. But she didn’t linger around the mountain meadows where ...

In a cave high atop a mountain, in a remote region near Yellowstone National Park, a mule deer doe gave birth to a fawn this spring.