| Code |
Code description
(see handbook for full description & use suggestions) |
|
PO Category - possible breeding evidence
|
| PO |
Species (male or female) observed within safe dates with no evidence of breeding. Not in suitable nesting habitat. |
| PX |
Species (male or female) observed in suitable nesting habitat during its safe dates. |
|
PR Category - probable breeding evidence
|
| PS |
7 or more singing males of a species observed during a single visit during their breeding season. |
| PP |
Pair observed in suitable nesting habitat during its breeding season. |
| PT |
Permanent territory presumed through either defense (e.g. chasing of other birds) or song at same location on at least 2 occasions 7 days or more apart or in an aerial display (Horned Lark, Cassin's Sparrow, Lark Bunting). |
| PC |
Courtship behavior or copulation. |
| PN |
Visiting probable nest site. |
| PA |
Agitated behavior or anxiety calls from adult. |
| PB |
Nest building by wrens or excavation of holes by woodpeckers. |
|
CO Category - confirmed evidence of breeding
|
| NB |
Nest bulding or adult carrying nesting material. |
| BP |
Physiological evidence of breeding based on brood patch. |
| DD |
Distraction display or injury feigning. |
| UN |
Used nest found. Must be carefully identified if it is to be accepted. |
| FL |
Recently fledged young that are still dependent upon the adults as evidenced by the adults' feeding the young or protecting the young. |
| ON |
Adults entering or leaving a nest site in circumstances indicating occupied nest. To be used for nests which are too high (e.g. the tops of trees) or enclosed (e.g. chimneys) for the contents to be seen. |
| FS |
Adult carrying fecal sac. |
| FY |
Adult carrying food for young. |
| NE |
Nest with egg(s). |
| NY |
Nest with young seen or heard. |
