Larus occidentalis was reported from 3 countries/islands


Table 1: the species is currently present in 3 of them (endemic, native, introduced);
Table 2: possible in 0 of them (stray, questionable);
Table 3: absent from 0 of them (extirpated, not established, misidentification, error).
Table 4: all reports listed together.

Distribution: Eastern Pacific and Western Atlantic. Subtropical to temperate.
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Table 1: Present in 3 countries/islands (endemic, native, introduced)
Continent Country Occurrence Main Ref.
North America Canada CAN native 93875
North America Mexico MEX native 356
North America USA USA native 80153

Table 4: Reported from 3 countries/islands.
Continent Country Occurrence Main Ref.
North America Canada CAN native 93875
North America Mexico MEX native 356
North America USA USA native 80153
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The map in this page was supported by BioFresh that has received funding from the
European Union's Seventh Programme for research, technological development and demonstration under grant agreement No 226874