Falcon Camera Questions
Have a question about peregrine falcons?
Send your question to Jeff Meshach at the World Bird Sanctuary! Your question along with Jeff's response may be posted here - so check this page often when you view the nesting falcons.
Current questions and responses
May 15, 2013
A question came in about territory size, and if placing more nesting boxes at Sioux Energy Center would attract more than one pair. The average territory size of a peregrine is roughly five square miles, but that number could be a lot larger, depending on prey availability. In theory, the more prey there is in an area, the more predators the area can support, and visa versa. However, peregrines can only tolerate another nesting pair so close. Then the line in the sand (or should I say air) is drawn. I know there’s another peregrine pair about three miles up the Mississippi on the Illinois side. Another pair is about seven miles upstream from that pair, on an Illinois cliff. Peregrines are fiercely territorial, and will attack other raptors species, including eagles, when the threat comes too close to their nest.
Height of the Nest
Someone asked about the height a peregrine nest must be from the ground. In my experience, I’ve a nest that is just 30 feet from the ground, and the highest nest I’ve seen is on the AT&T building, downtown St. Louis, which is 46 stories up! I don’t think there’s even an average I can give. If the location seems right to a pair, they will take advantage.
More about Peregrine Chicks
Another few questions were about predators of peregrine chicks, why both SiouxZee and Coal will try to pile all the kids under them during certain times of the day and how often the chicks are fed. All baby birds are more vulnerable to predators while in the nest. Many kinds of mammals and snakes will prey on babies in the nest, which is why baby birds grow so rapidly. The faster they can fly from the nest, the better chance they have of surviving.
Until they reach a certain size, baby birds cannot regulate their own body temperatures. Birds are more like their reptilian-like ancestors as babies, so mom or dad must brood them, which means provide them with warmth from their bodies, especially when there are cool temperatures.
The larger baby birds are the more food the parents must bring to the nest. Around 17 days old, the parents are probably coming in three to five times a day with food, but the following week will probably double the amount of food. Around 28 days of age, the babies will have quite a bit of strength in their feet, so you will start to see the parents bringing in food. One baby will take the item and try to get as far away from the others as possible to feed itself. You also may get to see the chicks fighting over food.
Replacing the Camera
The last question I want to address came from a school group who asked if the cost of replacing the camera was affecting us not repairing or replacing the camera. Please rest assured World Bird Sanctuary, Ameren Missouri and the Missouri Department of Conservation want all viewers of the Falcon Cam to get the best look possible at these avian miracles. We also want the birds and the workers that must approach the nest box to be as safe as possible. Taking the camera off its pedestal for replacement would take too long to accomplish, exposing workers to attacks from the parents and keeping the parents from their babies for too long a time period. When the weather warms up and the chance for condensation lessens, we should see a perfect picture of the family from dawn to dusk.
Thanks for the questions!
May 7, 2013
We are experiencing problems with the camera at Sioux Energy Center. With all the blowing rain a few weeks ago, some moisture got into the globe that protects the camera lens. The solution to this - a small heater within the globe - burnt out. On May 17, the chicks will be banded a short distance from the nest. While this is happening, Ameren personnel will try to repair the camera. The camera lens is the worst early in the morning, but the sun warming the globe helps to clear up the moisture late morning. We apologize for this problem and will do our best to repair it.
Several had questions about the process of egg hatching. At about 30 days, the chicks are ready to emerge from the egg. All unhatched bird chicks are equipped with an extra point on the end of the upper beak called the egg tooth. The chicks use this to punch a series of holes (that eventually form a circle) at the fat end of the egg. Once the circle is completed, the end of the egg falls away and the chick emerges. Mom and dad only provide verbal encouragement; they squeak and twitter, which stimulates the chick to keep making the holes with its egg tooth. The tooth should disappear soon, but can now still be seen on the chicks when their heads are sillouetted against the dark back of the box. Once the egg pipps, or the first hole is created, the process usually takes about 24 hours. It's hard work for such a small being, and there are times where the chick stops and rests. If an egg doesn't hatch, the chick's movements eventually push the egg off to the side. All four eggs have hatched this year - two chicks hatched on April 26 and the other two on April 27.
Leaving the Nest
Another had a question about the timeframe between hatching and fledging, or leaving the nest. All birds grow very quickly, for while in the nest they are more vulnerable to predation. Male peregrines usually fledge at 40-45 days, and females 50-55 days. The smaller, more agile males gain their flight skills earlier, with one of the thoeries being they leave the nest first so the bigger females don't mistake their brothers for food!
Lastly, I want to brace everyone for the potential of chick deaths. Because of natural processes, whether bacterial, large disparity in chick sizes or many other factors, chicks do die in the nest. Last year we were able to watch all five chicks leave the nest. This year and in years to come, we may not be so lucky. We cannot interfere with nature. To try and do something for a chick that may not be getting as much food as the others could jeopardize the other chicks, and maybe even me! The nest is 180 feet off the ground, just being up so high is a risky situation.
Eggs are laid two to three days apart. Usually a female bird will wait until the last egg is laid before she starts to seriously incubate. The wait helps make sure all the eggs hatch close to one another in time. If a bird has to incubate the first egg early, it may have a six- to nine- day head start on the last laid egg. Such a difference usually means the last chick or two hatched might get muscled out of food by the older chicks. This year, SiouxZee had to start incubating her eggs right as the first was laid because March was so cold. But as of this morning, all four chicks look healthy and happy, even getting a bite to eat when dad Coal brought in food.
Thanks for the questions!
April 9, 2013
Jeff, is there a pattern for the male falcon of when and what times he will feed or replace the female sitting on the eggs so she can eat? - Mark D.
There is probably a pattern on when he relieves her at the nest while eggs or young babies are present. Eggs must be incubated constantly once the incubation starts. Baby birds are much like reptiles; until they achieve the size and down feathers to regulate their own body heat, they must rely on the heat from mom or dad. This "temporarily changing of the guards" pattern can be figured out by someone that could watch most of the day for a few days in a row. There probably is not a pattern for dad bringing food to the nest for mom, only because dad doesn't catch food consistently enough to show a pattern. For birds of prey, it has been estimated for every food item brought to the nest, there are 10 unsuccessful attempts to catch food.
Does the mother falcon have to lie in a certain way so she doesn't crush or crack the eggs when she's incubating them? - Caitlin S.
Mom rarely puts all her weight the eggs. She parallels her lower legs (called the tarsus) to the nest materials under her and spreads out her legs enough to fit all the eggs in between them, with probably an egg or two forward from her legs and an egg or two behind her legs. One of the theories of why females are larger than males in birds of prey is the bigger body more efficiently incubates eggs and broods young babies.
March 27, 2013
Hi Jeff, is this the same pair of falcons as last year? And if so, do they migrate south and then return to this nesting site, or do they spend winter here? - Robert L.
It's a pretty safe bet to say that the Sioux peregrines stay on their territory year round. Adult birds and sometimes juveniles are seen periodically throughout the non-breeding season by Ameren Missouri's Sioux Energy Center personnel, either around the nesting box or perched near the energy center. Peregrines from further north definitely migrate south for the winter - sometimes all the way to South America.
We weren't able to get the band number of the male last year, so I'm not sure if this male is the same one. We did get his band number earlier this breeding season and now know this male was hatched at Ameren Missouri's Labadie Energy Center in 2004. I actually put the band on that bird in June of that year.
Thanks for the questions!