Code |
Code description
(see handbook for full description & use suggestions) |
OB Category - Observed: not breeding evidence
|
O |
Species (male or female) observed in a block during its breeding season with no evidence of breeding. Not in suitable nesting habitat. Includes species such as vultures or raptors flying over, or a colonial nesting species not at a nesting colony. |
PO Category - possible breeding evidence
|
SH |
Species (male or female) observed in suitable nesting habitat during safe dates. |
SM |
Singing male present, or breeding calls (or drumming by woodpeckers) heard, in suitable nesting habitat in breeding season during safe dates. |
PR Category - probable breeding evidence
|
S |
7 or more territorial males observed only once in the breeding season. |
P |
Pair observed in suitable nesting habitat during its breeding season. |
T |
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. |
C |
Courtship behavior or copulation. |
V |
Visiting probable nest site, or nest building by wrens or woodpeckers. |
A |
Agitated behavior or anxiety calls from adult. |
B |
Brood patch or cloacal protuberance. |
CO Category - confirmed evidence of breeding
|
NB |
Nest building or excavation of nest cavity by any species except wrens and woodpeckers, or adults carrying nest material excluding far-ranging species. |
DD |
Distraction display or injury feigning, or attacking humans or other predators. |
NU |
Used nests or egg shells found. Must be carefully identified, if they are to be accepted. |
FE |
Female with egg in oviduct. (For banders.) |
FY |
Recently fledged young or downy young incapable of sustained flight. |
CF |
Carrying food for young (not carrying food to a perch for its own consumption). |
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. |
IP |
Incubating position of bird (brooding, on eggs, or laying). |
NE |
Nest with egg(s). |
NY |
Nest with young seen or heard, or identifiable dead nestlings found. |