Condor Chick Watching: Age 30 to 45 Days

Cuyamaca does some preening in the nest box.

Cuyamaca does some preening in the nest box.

At about one month of age, our California condor chick Cuyamaca (pronounced “Kwee-ah-MACK-ah” and meaning “through the clouds” in Kumeyaay), should weigh around 4.4 pounds (2 kilograms). The parents, Sisquoc and Shatash, may start leaving the chick alone overnight, sleeping near the nest. If the weather is still cool or it’s raining, they may continue to brood overnight until the weather improves. Even though the parents are increasing their time away from the chick, they remain VERY vigilant and protective of their nest and ESPECIALLY their chick. Some field biologists have even seen wild condor parents chasing black bears away from the nest area!

Up until now, the chick has been scooting around the nest on its tarsal joints. We refer to that as a tarsal crawl. It’s not uncommon, at this age, to see the chick standing all the way up on its feet, teetering around the nest, holding its wings out for balance. As its legs get sturdier, the chick may even approach the parent, begging for food. The wing-begging behavior we’ve been seeing will get more pronounced: lots of wing-flapping, head-bobbing, and trying to position itself in front of the parent.

It is possible that the parents, who are offering larger quantities of food per feeding session, might be providing a small amount of fur/hair in the chick’s diet. (Part of the adults’ diet includes mammals, like rats and rabbits.) Condors can digest just about every part of the animals they eat, except for fur. This fur accumulates in the digestive tract and is eventually regurgitated as waste. We refer to this as casting. A condor’s cast is composed of predominantly fur, whereas a cast from an owl has fur and bones; owls can’t digest bones, but condors can. We have seen condor chicks cast hair pellets as young as three weeks of age. When the chick casts, it throws its head forward several times, mouth open, until the pellet is ejected from its mouth. It can look like the chick is in trouble, but it is perfectly normal and good for the chick.

At around 45 days of age, Cuyamaca will get its first health exam. We will obtain a blood sample for the lab to make sure the chick is healthy and send a portion of this sample to a lab in the Genetics Division of the San Diego Zoo Institute for Conservation Research. From this blood sample, the geneticists can determine if Cuyamaca is male or female. Also during the exam, we will weigh Cuyamaca (the chick should weigh between 7.7 and 8.8 pounds or 3.5 and 4 kilograms), and we will inject a transponder chip as a form of identification. It’s the same kind of chip you can get for your dog or cat at the veterinarian. Most importantly, this exam allows us to administer a vaccine for West Nile virus, a disease that originated in Africa and was accidentally introduced to North America by humans. North American animals, including condors, usually don’t have a natural immune response to West Nile virus, so we are trying to give our chicks as much of a head start as we can.

This exam will be the first time that Cuyamaca will see humans, so it will naturally be disturbing for the chick. We try to be as quick as we can (9 to 10 minutes) to minimize the disturbance. Additionally, we will keep Cuyamaca covered with a towel to reduce its exposure to humans and to provide it a bit of security. Sisquoc and Shatash are usually away from the nest when we perform the procedure to keep them as calm as possible, as well. We have to keep in mind that we don’t want Cuyamaca to become accustomed to or feel reassured by our presence; we want it to be a wild condor, uninterested and wary of humans, so that it may someday fly free in California, Arizona, or Mexico.

Cuyamaca will look very large at this age compared to how big it was at hatch, but remember that it is still less than half of its adult weight. There is much more growth and fun to come on Condor Cam!

Ron Webb is a senior keeper at the San Diego Zoo Safari Park. Read his previous post, Condor Chick Watching: Age 3 to 4 Weeks.

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