Code |
Code description
(see handbook for full description & use suggestions) |
OB Category - Observed: not breeding evidence
|
O |
Species (male or female) observed between June 1 and July 31, but not believed to be breeding in the block. |
PO Category - possible breeding evidence
|
X |
Species (male or female) observed in suitable nesting habitat during its safe dates. |
S |
Singing male detected once in possible suitable nesting habitat. |
PR Category - probable breeding evidence
|
M |
7 or more singing or territorial birds of a species detected within a block on one day. |
P |
Pair observed in suitable nesting habitat during its breeding season. |
T |
Permanent territory presumed through song at same location on at least 2 occasions 7 days or more apart. |
C |
Courtship behavior or copulation. |
N |
Visiting probable nest site. |
A |
Agitated behavior or anxiety calls from adult. |
B |
Nest building by wrens, verdins, or excavation of holes by woodpeckers. |
CO Category - confirmed evidence of breeding
|
NM |
Bird carrying nesting material, except for some species of wrens and verdins. |
NB |
Nest building by any species except wrens, verdins, and woodpeckers. |
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 nest found. Must be carefully identified if it is 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. |
FS |
Adult carrying fecal sac. |
FY |
Adult(s) with food for young, either carrying food or feeding young. |
NE |
Nest with egg(s), undisturbed nest with a bird in incubation posture, or eggshells found below nest. |
NY |
Nest with young seen or heard. |