| Code |
Code description
(see handbook for full description & use suggestions) |
|
PO Category - possible breeding evidence
|
| PO |
Possible category, code not available |
| X |
Species (male or female) observed in its breeding season in suitable nesting habitat, with no other indication of breeding noted. |
|
PR Category - probable breeding evidence
|
| PR |
Probable category, code not available |
| S |
Singing male present (or breeding calls heard) on more than one date in the same place. A good indication that a bird has taken up residence if the dates are 7 days or more apart. |
| T |
Permanent territory presumed through defense of territory (e.g. chasing individuals of the same species). |
| D |
Courtship and display, or agitated behavior or anxiety calls from adults suggesting probable presence of nest or young nearby; brood patch on trapped female or cloacal protuberance on trapped male. |
| N |
Visiting probable nest site. |
| B |
Nest building by wrens or excavation of holes by woodpeckers. |
|
CO Category - confirmed evidence of breeding
|
| CO |
Confirmed category, code not available |
| DD |
Distraction display or injury feigning. |
| NB |
Nest building by any species except wrens and woodpeckers. |
| UN |
Used nests or egg shells found. Must be carefully identified, if they are to be accepted. |
| FE |
Female with egg in oviduct. (For banders.) |
| FL |
Recently fledged young (of altricial species) incapable of sustained flight or downy young (of precocial species) restricted to the natal area by dependance on adults or limited mobility. |
| FS |
Adult carrying fecal sac. |
| FY |
Adult carrying food for 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), undisturbed nest with a bird in incubation posture, or eggshells found below nest. |
| NY |
Nest with young seen or heard. |
