An egg found in an abandoned eagle nest could herald the return of the California condor to Mexico, which hasn't had a breeding population of the iconic giant of the skies for about 75 years.
The California condor, once on the brink of extinction, is the largest bird in North America with a wingspan of almost 10 feet.
Egg was found March 25 on a cliff in the Sierra San Pedro de Martir National Park, located in the arid interior of the Baja California peninsula more than 100 miles south of the U.S.-Mexico border.
Scientists climbed to the nest and took photographs and measurements of the egg, shining a bright light through the shell to determine that the egg was 45 to 50 days old. Condor eggs incubate for 57 days, meaning the chick could hatch any day. There was also a chance the egg was dead, but no smell of sulfur and the parent condors were still tending to it.
The California condor was once widespread, swooping above the western United States, parts of Canada and Baja California.
A type of vulture, the condor scavenges dead fish and animals. As coastal population of seals and otters declined, so too did the bird. The use of poison to kill California's grizzly bears in the 1800s also devastated their numbers and lead shot remains a potential source of poison. Hunting, egg collecting and power cables were also blamed for hurting the creature's numbers.
Only 22 California condors were left by the 1980s, and the last documented sighting in Mexico was in the 1930s.
Thanks to a captive-breeding program, numbers recovered to a worldwide total of about 280. More than 100 of these fly free in the skies above parts of California, Nevada and Utah. Working with the Mexican government, biologists reintroduced captive-bred birds to Mexico in 2002.
Condors don't reproduce until they are several years old. The 7-year-old female that laid the egg in Mexico, known as Condor 217, was born at the Los Angeles Zoo.
Another species of condor, found in the Andes, is also threatened with extinction, but its numbers are in the thousands.
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Rare condor egg could hatch any day
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