| 1 | Species heard or observed within safe dates, but not in suitable breeding habitat. |
| 2 | Species heard or observed within safe dates, and in suitable breeding habitat |
| 3 | Territorial behavior, including counter singing males, territorial singing (repeatedly singing from |
| 4 | Pair (male and female) within safe dates, and in suitable breeding habitat |
| 5 | Pair (male and female) present at the same location 7 or more days apart |
| 6 | Courtship behavior (aerial displays, courtship feeding) or copulation |
| 7 | Visiting probable nest site |
| 8 | Agitated behavior and/or anxiety calls from an adult, suggesting presence of nearby nest or young |
| 9 | Brood patch (Note: code only applies to birds observed in hand and is reserved for experienced birde |
| 10 | Nest building observed at nest site (Note: for nest building by wrens, woodpeckers, kingfisher...) |
| 11 | Distraction display (especially injury feigning, such as broken wing display) or attacking/dive-bomb |
| 12 | Used nest; includes inactive nests |
| 13 | Recently fledged young that are incapable of sustained flight |
| 14 | Occupied nest, but contents not observed; adults entering and remaining for a period of time, then l |
| 15 | Adult carrying a fecal sac |
| 16 | Adult carrying food for young |
| 17 | Eggshells found below nest |
| 18 | Nest with adult incubating |
| 19 | Nest with nestlings or eggs |
| 30 | Possible breeding |
| 40 | Probable breeding |
| 50 | Confirmed breeding |
| 99 | No species despite active search |
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