Code description
(see handbook for full description & use suggestions)
PO Category - possible breeding evidence
v
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
S
Singing male present (or breeding calls heard) on more than one date in the same place.
T
Bird (or pair) apparently holding territory.
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
DD
Distraction display or injury feigning; coition.
NB
Nest building by any species except wrens and woodpeckers.
UN
Used nest found. Must be carefully identified if it is to be accepted.
FE
Female with egg in oviduct. (For banders.)
FL
Recently fledged young.
FS
Adult carrying fecal sac.
FY
Adult(s) entering or leaving nest site in circumstance indicating occupied nest.
NE
Nest with egg(s), undisturbed nest with a bird in incubation posture, or eggshells found below nest.
NY
Nest with young or downy young of waterfowl, quail, waders, etc.