• Massive petrified redwood stumps

    Florissant Fossil Beds

    National Monument Colorado

There are park alerts in effect.
show Alerts »
  • Prescribed Burning in October

    Fire crews plan to implement a prescribed burn on approximately 180 acres of monument land starting the week of October 13. This alert banner will be used to communicate whether or not burning is taking place on any given day. More »


One of the most common mammals in the park is the Richardson's Ground Squirrel (Spermophilus richardsonii). Because it often stands erect on its hind legs to survey its surroundings, Richardson's Ground Squirrel has acquired the nickname "Picket Pin." It is also called "Flickertail," for the way it accompanies its shrill whistle with a flick of its tail.

They are often mistaken for Prairie Dogs, however they are a little smaller. Richardson's Ground Squirrels are 8-10" body, 2-4' tail. They are solid golden brown, undersides are pale or white; No Stripes.

Although they are a rather solitary species, Richardson's Ground Squirrels sometimes lives colonially in favorable habitats, and is especially abundant where vegetation is short. In addition to its shrill whistle, this species also produces chirps, churrs, squeals, and tooth chatters. Its major predators are badgers, weasels, gopher snakes, hawks, and coyotes. These animals eat green vegetation, insects, and sometimes carrion. They have an extensive burrow for shelter and food storage. This ground squirrel hibernates from September to March.

The squirrel was named after the Scottish naturalist Sir John Richardson.

North Dakota is nicknamed the Flickertail state after the squirrel.

Did You Know?


Both adults and aquatic nymphs (juveniles) of damselflies and dragonflies have been found at Florissant fossil beds. You can tell the insect pictured is a damselfly because the wings are held above the body instead of held out horizontally like the wings of an airplane, as in dragonflies. This image is protected by copyright. All rights reserved. To learn More...