A1
Species observed in breeding season in possible nesting habitat
A2
Singing, drumming or displaying individual present in breeding season in possible nesting habitat
B3
Pair observed in suitable nesting habitat in breeding season
B4
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
B5
Courtship behavior (aerial displays, courtship feeding) or copulation
B6
Visiting probable nest site
B7
Agitated behavior and/or anxiety calls from an adult, suggesting presence of nearby nest or young
B8
Brood patch (Note: code only applies to birds observed in hand and is reserved for experienced birder only)
B9
Nest-building or excavating of nest-hole observed
C10
Distraction display (especially injury feigning, such as broken wing display) or attacking/dive-bombing humans in defense of unobserved nest or young
C11a
Used nest (occupied within period of survey); includes inactive nests
C11b
Eggshells found (laid within period of survey)
C12
Recently fledged young that are incapable of sustained flight
C13a
Adults entering or leaving nest-site in circumstances indicating occupied nest (including high nests or nest-holes, the contents of which can not be seen) or adult seen incubating
C13b
Nest with adult incubating
C14a
Adult carrying a fecal sac
C14b
Adult carrying food for young
C16
Nest with young seen or heard
Only if not any case above is applicable
E99
Not observed despite active search
