Birds of Boulder County

Featuring Photographs by Gerhard Assenmacher

This page is a work in progress. We have at least one beautiful photo now of every bird species likely to be seen in Boulder County. Information about each species is still being added as it becomes available. Check back often to see what’s new!

The Boulder County Audubon Society greatly appreciates the images donated below. Most are Gerhard’s photos, but he wants to acknowledge the following photographers who also contributed to this project:

  • Jennifer Price
  • Don Whittaker
  • Scott Rashid

The expanded version of each image bears a copyright notice, photographer’s name and information about each species.

Boulder County Species of Primary Concern (Hallock and Jones 2010) are listed in italics with special concern designations in parentheses. Visit www.bcna.org for access to the complete Boulder County birds of special concern list, which was compiled by Boulder County Nature Association in cooperation with Boulder County Parks and Open Space.

We have Steve Jones to thank for the status, population and conservation information for each bird. Gerhard, Steve and Amy Schlotthauer worked together to make this on-line field guide possible. They each would like to thank the others for their unique contributions to the project.

Click images to expand them and see species information, click “X” to return to birds or the play button to automatically scroll through each item.
Use arrow keys to advance forward and backwards through the images.

Swans, Geese, and Ducks


Top

Pheasants and Grouse


Top

Loons and Grebes


Top

Bitterns, Herons, and Ibis


Top

Vulture, Hawks, Eagles, and Falcons


Top

Rails, Coot, And Crane


Top

Shorebirds


Top

Gulls and Terns


Top

Pigeons and Doves


Top

Owls


Top

Nighthawk, Swifts, Hummingbirds, and Kingfisher


Top

Woodpeckers


Top

Flycatchers and Vireos


Top

Corvids


Top

Lark and Swallows


Top

Chickadees, Nuthatches, and Creeper


Top

Wrens, Gnatcatcher, Kinglets, and Dipper


Top

Thrushes


Top

Starling, Pipit, and Waxwings


Top

Warblers

Separating Mountain Warblers by Nesting Habitat and Song

McGillivray’s, Virginia’s, Wilson’s, and Yellow-rumped Warblers are most easily separated by song and habitat, since they are often difficult to see as they hop around in the foliage of mountain conifer forests and wetlands:

Species Nesting Habitat Song
McGillivray’s Warbler Riparian shrub Seven or fewer hoarse “shree” notes
Virginia’s Warbler Open forests Nine or more descending “see” notes
Wilson’s Warbler Willow thickets Series of “chee” notes on same pitch
Y.-rumped Warbler Denser forests Slow tinkling or trilling warble


Top

Towhees and Sparrows


Top

Tanager, Grosbeaks, Bunting, and Blackbirds


Top

Finches and Weaver Finch


Top

©Boulder County Audubon Society. All rights reserved. Web Design by Floyd Dog Design

User Login