| Code |
Code description
(see handbook for full description & use suggestions) |
|
OB Category - Observed: not breeding evidence
|
| O |
Species (male or female) observed during its breeding season, but not believed to be breeding in the block. Not in suitable nesting habitat. |
|
PO Category - possible breeding evidence
|
| X |
Species (male or female) observed in suitable nesting habitat during its safe dates. |
|
PR Category - probable breeding evidence
|
| S |
7 or more singing or territorial birds of a species detected within a block on one day. |
| A |
Agitated behavior or anxiety calls from adult. |
| P |
Pair observed in suitable nesting habitat within safe dates. |
| T |
Territorial behavior or singing male present at same location on at least 2 different days, 7 days or more apart. Territoriality can be presumed from defensive encounters between individuals of the same species, or by observing a male singing from a variety of perches within a small area. |
| C |
Courtship behavior or copulation. |
| N |
Visiting probable nest site. |
| B |
Nest building by wrens or excavation of holes by woodpeckers. |
|
CO Category - confirmed evidence of breeding
|
| PE |
Physiological evidence of breeding based on brood patch or cloacal protuberance. (For banders.) |
| NB |
Nest building by any species except wrens and woodpeckers or adults carrying nesting material. |
| DD |
Distraction display or injury feigning. |
| UN |
Used nest found. Must be carefully identified if it is to be accepted. |
| FL |
Recently fledged young or downy young. This includes dependent young only. |
| FS |
Adult carrying fecal sac. |
| FY |
Adult feeding recently fledged 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. |
| NE |
Nest with egg(s), or eggshells on the ground. |
| NY |
Nest with young seen or heard. |
