Sampling & coverage
Each block consists of 1/6 of a USGS 7.5 minute topographic quad. Of a total of 120 quads for the state, 117 contained blocks with data. All 596 established blocks were surveyed.
View blocks in the Mapping Tool >>
Coordination of coverage
The state was divided into the following eight regions, each of which was assigned a coordinator: Northwest, North Central, Northeast, West Central, Lower Connecticut River Area, Southeast, Southwest, and New Haven area.
(see handbook for full description & use suggestions)
OB Category - Observed: not breeding evidence
Species (male or female) observed in its breeding season with no evidence of breeding.
PO Category - possible breeding evidence
Species (male or female) observed in suitable nesting habitat during its breeding season.
Singing male present in suitable nesting habitat during its breeding season.
PR Category - probable breeding evidence
Pair observed in suitable nesting habitat during its breeding season.
Permanent territory presumed through registration of territorial behavior (song, etc.) on at least 2 days, 7 days or more appart, at the same place.
Courtship behavior or copulation.
Visiting probable nest site.
Agitated behavior or anxiety calls from adult.
Nest building by wrens or excavation of holes by woodpeckers.
CO Category - confirmed evidence of breeding
Nest building by any species except wrens and woodpeckers.
Physiological evidence of breeding, e.g. highly vascularized, edematous brood patch or egg in oviduct based on bird in hand. (For banders.)
Distraction display or injury feigning.
Used nest found. Must be carefully identified if it is to be accepted.
Recently fledged young or downy young of Galliformes, shorebirds or waterfowl. Fledged young should be incapable of sustained flight.
Adults entering or leaving nest site in circumstances indicating occupied nest (including high nests or nest holes, the contents of which cannot be seen); or adult incubating.
Attending young: adult carrying fecal sac or food for young, or feeding recently fledged young.
Nest with egg(s).
Nest with young seen or heard.
- - this atlas does not record habitat on the field card - -
Most of the information on this page is from
the project's publication or Handbook
(guide for field work).