A migratory glitch leads some Rufous Hummingbirds to migrate east rather than south. Generally speaking, individual birds that migrate to the east by mistake die. However, a number of them have survived and have transmitted this tendency to migrate east to their progeny. This trend is the result of an improved survival rate due to the presence of feeders. If food and shelter are available, Rufous Hummingbirds are astonishingly robust; they are capable of tolerating temperatures of nearly -20°C.


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