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
|
H |
Species observed in suitable nesting habitat during its breeding season. |
X |
Singing male present in suitable nesting habitat during its breeding season. |
PR Category - probable breeding evidence
|
P |
Pair observed in suitable nesting habitat during its breeding season. |
T |
Permanent territory presumed through defense of territory (e.g. chasing individuals of the same species). |
C |
Courtship behavior or copulation. |
N |
Visiting probable nest site. |
A |
Agitated behavior or anxiety calls from adult. |
B |
Nest building by wrens or excavation of holes by woodpeckers. |
M |
7 or more singing or territorial birds of a species detected within a block on one day. |
CO Category - confirmed evidence of breeding
|
NB |
Nest building at the actual nest site. |
PE |
Physiological evidence of breeding, e.g. highly vascularized, edematous brood patch or egg in oviduct based on bird in hand. (For banders.) |
DD |
Distraction display or injury feigning. |
UN |
Used nests or egg shells found. Must be carefully identified, if they are to be accepted. |
FL |
Recently fledged young (either precocial or altricial) incapable of sustained flight, restricted to natal area by dependence on adults or limited mobility. |
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. |
AY |
Attending young: adult carrying fecal sac or food for young; not used for terns or Osprey. |
NE |
Nest with egg(s). |
NY |
Nest with young seen or heard. |