| OBSERVED | | X | Species observed in its breeding season (no breeding evidence) | | POSSIBLE | | H | Species observed in its breeding season in suitable nesting habitat | | S | Singing male(s) present, or breeding calls heard, in suitable nesting habitat in breeding season | | PROBABLE | | M | Multiple singing males (7 or more) found during one visit within the same square, during the breeding period in suitable nesting habitat. Most species listed as (M) can be upgraded during other visits. Use with caution to avoid counting migrants. | | P | Pair observed in suitable nesting habitat in nesting season | | T | Permanent territory presumed through registration of territorial song, or the occurrence of an adult bird, at the same place, in breeding habitat, on at least two days a week or more apart, during its breeding season. Use discretion when using this code. "T" is not to be used for colonial birds, or species that might forage or loaf a long distance from their nesting site e.g. Kingfisher, Turkey Vulture, and male waterfowl | | D | Courtship or display, including interaction between a male and a female or two males, including courtship feeding or copulation | | V | Visiting probable nest site | | A | Agitated behaviour or anxiety calls of an adult | | B | Brood Patch on adult female or cloacal protuberance on adult male | | N | Nest-building or excavation of nest hole by wrens and woodpeckers |
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| CONFIRMED | | NB | Nest building or carrying nest materials, for all species except wrens and woodpeckers | | DD | Distraction display or injury feigning | | NU | Used nest or egg shells found (occupied or laid within the period of the survey) | | FY | Recently fledged young (nidicolous species) or downy young (nidifugous species), including incapable of sustained flight | | AE | Adult leaving, occupying or entering nest sites in circumstances indicating occupied nest (eg. sitting on nest) | | FS | Adult carrying fecal sac | | CF | Adult carrying food for young | | NE | Nest containing eggs | | NY | Nest with young seen or heard |
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