Sheri L. Williamson:
Peterson Hummingbirds 2nd edition plate mock-up
Sheri L. Williamson:
Ruby-throated Hummingbird with worn gorget
Sheri L. Williamson:
Anna's Hummingbird with molting gorget
Sheri L. Williamson:
Anna's Hummingbird with worn gorget
Sheri L. Williamson:
Rufous Hummingbird, adult male
Sheri L. Williamson:
Gorget variation in female Black-chinned Hummingbirds
Sheri L. Williamson:
Black-chinned Hummingbird juvenile female
Sheri L. Williamson:
Broad-tailed "female-plumaged" montage
Sheri L. Williamson:
Gorget montage
Sheri L. Williamson:
Hummingbird "eyelashes"
Sheri L. Williamson:
Costa's vs. Calliope primary shape
Sheri L. Williamson:
Black-chinned and Anna's wings
Sheri L. Williamson:
Rufous/Allen's vs. Calliope wings
Sheri L. Williamson:
Broad-tailed and Calliope wings
Sheri L. Williamson:
Wing comparison of the Newark, DE hybrid hummingbird
Sheri L. Williamson:
Broad-tailed Hummingbird adult male tails
Sheri L. Williamson:
Broad-tailed tail montage
Sheri L. Williamson:
Rufous Hummingbird tail variations
Sheri L. Williamson:
Calliope tails
Sheri L. Williamson:
Rufous and Broad-tailed hummingbirds female tails
Sheri L. Williamson:
Rufous Hummingbird female tails
Sheri L. Williamson:
Allen's vs. Rufous: juvenile male tails
Sheri L. Williamson:
Allen's vs. Rufous: adult male tails
Sheri L. Williamson:
Anna's Hummingbird adult male tails
Sheri L. Williamson:
Hansen Gyllenhaal Broad-tailed scaled silhouettes
Sheri L. Williamson:
Hansen Gyllenhaal Broad-tailed overlay
Sheri L. Williamson:
Rufous Hummingbird range map
Sheri L. Williamson:
Allen's Hummingbird range map
Sheri L. Williamson:
Anna's Hummingbird on feeder with melting snow
Sheri L. Williamson:
Sitko hummers in the White Mountains, July 2007
