Presented by Colorado Bird Atlas Partnership:

The Second Colorado Breeding Bird Atlas


Atlas Species Gained / Lost

Species Gained

Species reported during the Second Colorado Breeding Bird Atlas (2007−2012) that were not reported during the First Colorado Breeding Bird Atlas I (1987−1995).

Species # of Blocksa Breeding Status
Hooded Merganser 8 Confirmed
Yellow-crowned Night Heron 1 Confirmed
Common Black-Hawk 1 Possible
Franklin’s Gull 8 Confirmed
Eurasian Collared-Dove 821 Confirmed
White-winged Dove 26 Confirmed
Inca Dove 1 Confirmed
Black-and-white Warbler 1 Possible
Lucy’s Warbler 3 Probable
Kentucky Warbler 1 Probable
Northern Parula 2 Probable
Prairie Warbler 2 Confirmed
Black-chinned Sparrow 2 Confirmed
Scarlet Tanager 1 Probable

a Includes non-priority blocks.


Species Lost

Species reported during the First Colorado Breeding Bird Atlas I (1987−1995) that were not reported during the Second Colorado Breeding Bird Atlas (2007−2012).

Species # of Blocksa Breeding Status
Ruffed Grouse 1 Confirmed
Little Blue Heronb 1 Confirmed
Caspian Tern 1 Probable
Red-backed Hawk 1 Confirmed
Anna’s Hummingbird 1 Probable
Eastern Wood-Pewee 1 Probable
Sedge Wren 2 Probable
Blue-winged Warbler 1 Probable
Golden-winged Warblerb 1 Confirmed
Prothonotary Warbler 1 Probable
Yellow-throated Warbler 1 Probable

a Includes non-priority blocks.
bReported as Observed in Atlas II.