The sun was well up when we assembled at 6 AM, but it still was cold and we were all gloved and hatted. This week we had one focus: Great Blue Herons. Bill took us to the rookery on Eagles Nest. I didn’t even know that Ely had a rookery, and it turns out there are at least two.
Finding the rookery is not easy. I’d suggest that anyone not really familiar with the area find a guide. From the Eagles Nest Road we turned west on to Walsh Rd., then wound along that extensive peninsula with its astonishing number of cottages. We stopped and parked at a gated access to the Tomahawk snowmobile trail, went left on the trail only a short distance, and then struck off right on a very faint footpath.
The area is one of extremely tall Red and White Pines. Our appearance in the area – even though we were at least 200 ft from the nesting area – was designed to observe from afar and not disturb the birds. We could hear a cacophony of sounds and see birds flying over.
We easily could see about five occupied nests; the birds must be incubating eggs. Unlike an eagle’s nest, these must be quite shallow as we could easily see the sitting birds. They were visiting with one another as well – imagine a long-legged Heron perched on a swaying branch of a pine tree! Other birds were to-ing and fro-ing, often with sticks suggesting that some remodeling was in progress. (I hope some of Dan’s photos of the lumber re-supply flights turn out.)
According to Bill, Heron nests are extremely flimsy-looking collections of sticks; you can even see through them. Nevertheless, they must be sturdy enough to hold the weight of at least three birds. Bill told us that they use the same nests year after year. Gradually, the accumulation of guano on the trees and nearby grounds will kill trees and reduce the variety of plants.
Bill also told us that when he has hiked in after the young are dispersed, he has found as many as 30 nests in this immediate area. I found it curious that the nests were smack dab in the middle of a forested area. I expected them to be on the shore of a lake since all the heron’s food comes from the lake. However they are only a short flight from the numerous bays of the nearby lakes.
Eagles Nest lakes, with their shallow bottoms and lots of shoreline, offers their favorite foods, crayfish and panfish. And the tall, tall trees give them a seriously long view. Imagine 60 alarmed herons (each having a six-foot wing span!) rising up to chase off an intruder.
When the birds were agitated, we heard their hoarse and guttural squawks, hoots and squeaks, atonal sounds that can only be described as primitive, conjuring up scenes of Pre Cambrian jungles. I’ve heard that sound before but not known what it was.
The Great Blue Heron generally lays three to four eggs and incubates them for 28 days. It takes between 8 1/2 and 11 weeks before the young fledge. Shortly after that they disperse.
The only other birds of much interest were a Yellow-bellied Sap Sucker busily tattooing a dead tree and the lovely Evening Grossbeak.