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Figure 2. Key to species range maps.

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Resident breeding species; breeding sites may be rather local for some species,

especially colonial waterbirds

Seasonal breeding migrant, usually in summer; breeding sites may be rather local

for some species, especially colonial waterbirds

Seasonal nonbreeding migrant, usually in winter but may be year-round for some

species, especially waterbirds

Transient migrant

Breeding colony or isolated population

Occurrence possible or reported, status in need of elucidation or confirmation

Direction of range expansion

San José