Laura Erickson's For the Birds

The Parasitic Jaeger takes its first name from it’s habit of kleptoparasitism–stealing food from other birds, especially gulls and terns, sometimes pulling the items out of the victim’s mouth, other times harrying it till the bird vomits. The word jaeger means hunter.

Parasitic Jaegers nest in the high tundra, winter far down in the Southern Hemisphere, and mostly stay far offshore in oceanic waters during their migration, but at least a few appear on the Great Lakes every spring and fall, a handful sometimes reaching western Lake Superior.