Great Horned Owls (GHOW) are found all across North America – literally, they exist everywhere from the hot swampy areas of Florida to the deserts of the Southwest to the prairies and mountains of Canada. There is currently no concern for them in terms of declining populations. Just because there is no decline does not mean that the owls should not be monitored. Monitoring means that researchers can see when a decline does happen and they can ask why.
In the 1970s many bird populations were wiped out due to the use of DDT. DDT was a pesticide and it was banned in 1972 after Rachel Carson wrote Silent Spring in 1962 exposing the issues. It took a decade for change to happen but it did happen.
So the question then is, why in 2014 were birds dying in Michigan with levels of DDT poison so high in their brains that no one could believe the readings? Songbirds such as Robins, European Starlings, and bluebirds were dropping dead in people’s yards. DDT was not only found in the brains of the dead birds in enormous concentrations but it was also found in the worms that the birds ate. A professor at the University of Michigan looking into the phenomena found that the concentrations ranged from 155 to 1043 parts per million with the average being 552. The threshold for death is 30 parts per million. DDT persists in the soil and in the rivers. It thins the eggs of birds so that they break and cannot be incubated. It makes the birds sick and it is not a quick death but a slow painful one. The authorities in Michigan found that the Velsicol Chemical Corporation was responsible. Under their old name, Michigan Chemical, they manufactured pesticides. It is the area around their old plant where the soil, in 2014, was still saturated with the poison.
Today, the raptors – not the seed eating birds – have issues with various types of designer poisons for mice and rats. They are commonly called Rodenticides. In the United States, the name of one of the biggest companies manufacturing this poison is deConn. And, like when we want a tissue for a runny nose, many will ask for a ‘Kleenex’. Owls eat a lot of mice and rats. In fact, they are the absolute best and cheapest way to rid an area of these rodents. Someone could start a company, ‘Hire an Owl’.
And speaking of owls and mice, I have some great shots of Bonnie and Clyde for you tonight. And I have the answer to two questions sent to me by e-mail. I will incorporate those in the text. Thank you to those who wrote and asked – always happy to answer if I can or to help find the answer.
First of all, owls are noctural but like all other raptors they actually do a lot of hunting right at dusk and dawn. Owls do not see colour very well because nature provided them with sensitive dark-light rod cells instead of ones for differentiating colour. During the day, Clyde will sleep just like Bonnie, if she can. Clyde will not bring food to Bonnie during the bright light of day. But you might expect him to come, if prey is plentiful, right after dusk. Let us hope that none of the mice or rats that Clyde brings Bonnie have eaten any pesticides.
Dusk was at 6:39 pm in Newton, Kansas where the Bald Eagle Nest that Bonnie and Clyde are using is located. Between 6:55 and 8:04 pm, Bonnie made three trips off the nest. The first was at 6:55. She raises her head. Did she hear Clyde? She leaves the nest and returns at 7:03. That was eight minutes. She might have needed a bathroom break and she might have had something to eat.
At 7:21, we can see Clyde’s eyes. Clyde lands on a branch. Bonnie hears him.
Bonnie gets up. Clyde has brought her a mouse!
They do a quick exchange.
And Bonnie is back on the nest. It took a whole two minutes.
Bonnie takes another very short break from 7:57 to 8:04. Just like the first time she left this evening, the camera is fixed on the next so we cannot see what happens outside the frame. The temperature has really warmed up from the frigid minus degrees. It is 29 degrees F. The hunting might be a lot better because the mice will not be hunkered down with the cold. They will also be out looking for food while Clyde is looking for them!
Those beautiful big owl eyes are the reason that Clyde will be his busiest hunting within two hours of dusk and two hours of dawn. It is quite possible then that all three of Bonnie’s departures after dusk had to do with food deliveries and bathroom breaks together.
It is dawn, 6:27 am at the nest and Clyde has brought in his last mouse for the night. He arrives on his ‘regular’ branch. You should be able to see the mouse hanging out of his beak.
The pair have this all worked out. Bonnie and Clyde do some hoots and she flies up to the upper branch on the left.
Bonnie then flies up to grab the mouse from Clyde and within a blink that mouse becomes owl and she is back on her nest in two minutes. This couple is extremely efficient!
Besides hunting, Clyde’s other duty is to protect the territory of the nest and Bonnie. He will not be far away!
Just a couple of quick observations for today and then something special at the end.
The little eaglets on the Southwest Florida nest at Fort Myers, E17 and E18 are itchy. E18 was preening 17 and then they both wake up in the night and start preening. You will see that their flight feathers are just starting to come in. (Note: The dark object is a piece of an armoured fish). Here are a few images of these two itchy characters:
Over at the other eagle nest in NE Florida at St Augustine, little NE24 is getting its pin feathers, too. Sometimes these are called ‘blood’ feathers because they are filled with blood while they are growing. Some of you might remember that Hope, the oldest eaglet on Connie and Joe’s nest at Captiva, Florida died because she broke a blood feather and bled out. That was because of the rodenticide in the prey she had been fed. So blood feathers. Our new words for the day!
I am absolutely in love with this little eaglet. Maybe because it is all alone on that big nest without any siblings. But, at the same time, that is such a plus. There is no anxiety watching this nest. Gabby and Samson do a fine job taking care of this little one. And its eyes cleared up all on its own.
The soft glow of dusk is filtering through the trees in the swamp. NE24 has a nice crop before bed. You can see that the feathers are changing colour from white to grey. You can also see the pin feathers just starting to come in. Poor thing. It will not only have to deal with all those mosquitoes but now these things coming in!
Now for something just a little special. Most Bald Eagles do not start breeding until they are much older than five years even though they can at four to five years. In a nest in Minnesota supervised by the Department of Natural Resources, a four year old Bald Eagle male (called a sub adult) is going to get to see his first egg for the very first time. His beak is still a brown or amber colour instead of the bright yellow and he still retains some of the brown feathers mixed with the white on his head. It is thirteen minutes long – and no, he is not dirty. He is just a youngster. His eyes have not gotten light yet either. Enjoy!
Thank you again for joining with me to learn about the birds we all love so much. It is my pleasure to share them with you. Tomorrow we best check in on some Royal Albatross and what their satellite trackers are showing and we will also try and find Solly ——- and, of course, see what Bonnie and Clyde are up to. The weather patterns are shifting again and I am sad to say that the Bald Eagle Nest in New Jersey is once again covered with snow. This mom with three eggs under her never seems to catch a break.
Thank you to the streaming cams of Derek the Farmer, Duke Farms, SWFL Eagle Cam and D Pritchett Real Estate, NEFL Eagle Cam, and to Lady Hawk for making that great video of our young eagle dad.