Key for the Breeding Evidence Codes
Code	Description	Category
M	Migrant	Obs
O	Observed during breeding season	Obs
J	Juvenile bird independent of adults	Obs
X	Seen or heard within safe dates (SD)	Poss
H	Singing males within safe dates	Poss
F	Five distributed males/route (obsolete)	Prob
7	Seven or more pairs, 1 day, within SD	Prob
P	Pair during safe dates	Prob
T	Territorial behavior	Prob
C	Courtship behavior or copulation	Prob
N	Visiting probable nest site (obsolete)	Prob
A	Agitated behavior not provoked by humans	Prob
B	Nest building (wrens) excavation (woodp)	Prob
CO	Copulation by a resident species	Conf
CN	Carrying nesting material	Conf
NB	Nest building (except wrens & woodpkrs)	Conf
DD	Distraction display	Conf
UN	Used nests or eggshells found	Conf
FL	Recently fledged or downy young	Conf
BG	Begging young heard but not seen	Conf
FS	Adult carrying fecal sac	Conf
FY	Ambiguous & obsolete. Use NY, CF, or FL	Conf
CF	Adult carrying food for young	Conf
ON	Occupied nest (can't see contents)	Conf
IP	Incubating position	Conf
NE	Nest with egg(s)	Conf
NY	Nest with young	Conf