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Which grebe species have reduced wings and rarely fly?
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Grebe
Slavonian, or horned, grebe (Podiceps auritus)
While most grebes are capable of flight, certain species have evolved reduced wings and exhibit limited or no flight capabilities. Specifically, the short-winged grebe (Rollandia micropterum) of Lake Titicaca is flightless. Two other species—Taczanowski’s grebe (Podiceps taczanowskii) of Lake Junín, Peru, and the giant pied-billed grebe (Podilymbus gigas) of Lake Atitlán, Guatemala—possess somewhat reduced wings and fly little, if at all.1