Presented by Colorado Bird Atlas Partnership:

The Second Colorado Breeding Bird Atlas


Atlas Effort Summary Results

Effort Statistic Atlas I  (1987–1995) Atlas II (2007–2012)
# of field workers 1,170 785
Total person-hours 73,486 54,773
Priority block person-hours 68,057 49,014
Mean # person-hours/priority block * 38.6 28.1
Priority block party-hours 38,289 35,853
Mean # party-hours/priority block * 21.7 20.5
Total mileage 649,433 596,794
Total # records 86,499 195,121
# records (highest evidence/species/block) 86,499 98,752
# priority block records 71,433 163,686
Total blocks with data 2,696 4,507
# priority blocks with data 1,761 1,745
# priority blocks completed 1,650 1,632

* - Excludes priority blocks with no data.