Summer nonbreeding range. Mainly in marine and marine coastal areas from the Gulf Coast through Central America to n. South America. Scattered records inland. Up to thousands on Salton Sea in s. Interior U.S. records of summer birds in nonbreeding range may include late spring or early fall migrants.
Thick lines show peak activity, thin lines off-peak.
Mainly marine and marine coastal areas of Central America and n. South America, both Pacific and Caribbean. Scattered records inland. Occurrence in many areas irregular. Food capture and consumption. May hover briefly before sudden drop or swoop to surface, then dips bill into water or picks insects off vegetation.