Habitats and their associated birds Colorado is blessed with a tremendous variety of habitat types, which results in a tremendous variety of birds. In order to find a bird, you are best off looking for its habitat, and this requires at least a basic knowledge of Colorado's flora and geology. This section describes the main habitat types and some birds that are associated with them and may be hard to find elsewhere. Sagebrush Foothill Shrubs Spruce-Fir Forest Yucca Ponderosa Pine Forest Alpine Tundra Shortgrass Prairie Aspen Groves Cliff Faces Lowland Riparian Woodland Lodgepole Pine Forest Subalpine Life Zone Scrub Oak Woodland Streamside Willows Rimrock and Mesa Country Pinyon-Juniper Forest Also called Boreal Forest, this habitat is usually named for its dominant trees, Engelmann Spruce (Picea engelmannii) and Subalpine Fir (Abies bifolia). The latter is a distinctive tree with shiny silver bark marked by short horizontal lines. Young Douglas-Firs (Pseudotsuga menziesii) can look similar, but only Subalpine Firs retain the silver sheen when mature. If you are in an area with a good number of large Subalpine Firs, you can be confident that you are somewhere between about 9,500 and 11,000 feet, in the highest of the true forest zones, traditional home of Boreal Owl, Three-toed Woodpecker, Hammond's Flycatcher, Gray Jay, and Pine Grosbeak.