N
Species observed in breeding season
B
Species observed in breeding season in possible nesting habitat
D
Singing, drumming or displaying individual present in breeding season in possible nesting habitat
P
Pair observed in suitable nesting habitat in breeding season
T
Territorial behaviour (song, fights with neighbour etc.) on at least two different days a week or more apart at same place indicating a permanently occupied territory
R
Courtship behavior (aerial displays, courtship feeding) or copulation
V
Visiting probable nest site
U
Agitated behavior and/or anxiety calls from an adult, suggesting presence of nearby nest or young
L
Brood patch (Note: code only applies to birds observed in hand and is reserved for experienced birder only)
G
Nest-building or excavating of nest-hole observed
AU
Distraction display (especially injury feigning, such as broken wing display) or attacking/dive-bombing humans in defense of unobserved nest or young
LL
Used nest (occupied within period of survey); includes inactive nests
RM
Recently fledged young that are incapable of sustained flight
JB
Adult carrying food for young
AL
Eggshells found (laid within period of survey)
LM
Nest with young seen or heard
Only if not any case above is applicable
99
Not observed despite active search
