• Knightia eocaena mass mortality

    Fossil Butte

    National Monument Wyoming

Animals

Pronghorn antelope are commonly seen in the sagebrush filled valleys of the Chicken Creek drainage.

Pronghorn antelope.

NPS photo

More than 100 species of birds, mammals, snakes, and amphibians are known to frequent Fossil Butte National Monument. With the exception of large ungulates and carnivores, more species are expected to be discovered in the future.

Did You Know?

Fossil Butte from a distance

Fossil Butte National Monument preserves only 1% of the Fossil Lake deposits, the smallest of three ancient lakes that make up the famous Green River Formation.