The Secret For a 20/20 Vision Is Now UNVEILED

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The Secret For a 20/20 Vision Is Now UNVEILED

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mingbird migrates more extensively and nests farther north than any other hummingbird species, and must tolerate occasional temperatures below freezing in its breeding territory. This cold hardiness enables it to survive temperatures below freezing, provided that adequate shelter and food are available.

As calculated by displacement of body size, the rufous hummingbird makes perhaps the longest migratory journey of any bird in the world. At just over 3 in long, rufous birds travel 3,900 miles one-way from Alaska to Mexico in late summer, a distance equal to 78,470,000 body lengths. By comparison, the 13-inch-long Arctic tern makes a one-way flight of about 11,185 miles, or 51,430,000 body lengths, just 65% of the body displacement during migration by rufous hummingbirds.

The northward migration of rufous hummingbirds occurs along the Pacific flyway and may be time-coordinated with flower and tree-leaf emergence in spring in early March, and also with availability of insects as food. Arrival at breeding grounds before nectar availability from mature flowers may jeopardize breeding opportunities.

Diet and specializations for food gathering

Lesser violetear at a flower
File:Hummingbird.ogv
Hummingbird in Copiapó, Chile: The apparent slow movement of its wings is a result of the stroboscopic effect.
For nutrition, hummingbirds eat a variety of insects, including mosquitoes, fruit flies, gnats in flight, or aphids on leaves and spiders in their webs. The lower beak of hummingbirds is flexible and can bend as much as 25 degrees when it widens at the base, making a larger surface for catching insects. Hummingbirds hover within insect swarms in a method called "hover-hawking" to facilitate feeding.

To supply energy needs, hummingbirds drink nectar, a sweet liquid inside certain flowers. Like bees, they are able to assess the amoun

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