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.