| 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 | At least 7 individuals singing or producing other sounds associated with breeding (e.g., calls or drumming), heard during the same visit to a single square and in suitable nesting habitat during the species' breeding season. | | 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 a wren or a woodpecker |
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| CONFIRMED | | NB | Nest-building or excavation of nest hole by a species other than a wren or a woodpecker | | 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 yound (nidifugous species) incapable of sustained flight | | AE | Adult leaving or entering nest sites in circumstances indicating occupied nest | | FS | Adult carying fecal sac | | CF | Adult carying food for young | | NE | Nest containing eggs | | NY | Nest with young seen or heard |
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