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Condor - School Essays

Condor


California s are the largest birds in North America. They may weigh up to 25 pounds and have wingspans of 9 1/2 feet. California s have bare heads and necks, dull gray-black feathers, and blunt claws. They have a triangle-shaped patch of white, visible only when airborne, that adorns the underside of their wings.
California s can soar on warm thermal updrafts for hours, reaching speeds of more than 55 miles per hour and altitudes of 15,000 feet.
Normally, California s do not become sexually mature until the age of 6 and may not start breeding until age 7 or 8. They nest in caves or clefts on cliffs that usually have nearby trees for roosting and a clear approach for easy take-offs and ...

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by rubbing them on grass, rocks, or tree branches. s also bathe frequently and spend hours preening and drying their feathers.
s were probably never very numerous in North America. The species once ranged along the entire Pacific Coast from British Columbia to Baja California. Fossils have been found as far east as Texas, Florida, and New York. More recently, however, they were confined to a horseshoe-shaped area north of Los Angeles.
For years, no one knew precisely how many California s existed, although they have been considered to be a declining species since the 1890s. One estimate put their number at 100 in the early 1940s. Another indicated there were 50 to 60 in the early 1960s. By the late 1970s, the estimate had dropped to 25 to 30 birds.
Nor, despite years of study, can scientists pinpoint the reason for the bird's decline. Some factors include illegal collection of s and their eggs, poisoning from substances put out by ranchers to eradicate livestock predators, ...

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PAPER DETAILS
Added: 9/29/2005 03:02:20 PM
Category: Science & Nature
Type: Premium Paper
Words: 1212
Pages: 5

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