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It gets more care and attention than a Faberge egg. Buenos Aires zookeepers weigh and monitor the precious egg of a condor. The zoo's conservation director, Vanesa Astore, describes the process. SOUNDBITE (Spanish) BUENOS AIRES ZOO CONSERVATION DIRECTOR, VANESA ASTORE, SAYING: "We look at the chick, how it is moving and how the pocket of air in the egg is growing. And we control its weight because during the whole process it has to drop between 11 and 15 percent of its initial weight. So we help it along so that when it hatches on day number 60 it is in the best form, it is strong and we can assist it by being there at the moment it hatches." They're part of a program to protect the endangered birds. The condor is on the World Conservation Union's "vulnerable" list. And so, every condor egg in this zoo is closely monitored. When it hatches, it'll be taken to the nursery. There, it'll join two baby condors that were hatched just 30 days ago. They're already as big as small chickens. Condors are the largest flying birds in the world, boasting a wingspan nearly 10 feet wide. That's more than three meters. The workers use puppets to make the chicks think they're under the wings of an adult condor. One year from now, they hope to release the condors into the wild. Fred Katayama, Reuters.