February 27, 2017 at 7:52 am (birds, geology, mammals)
Tags: Berberis thunbergii, great horned owl, hooded warbler, Japanese honeysuckle, kame, St. James Farm, tree cavity, whitetail deer
by Carl Strang
This has been a relatively slow winter at St. James Farm Forest Preserve. There has been little snow, so my tracking has been limited. Coyotes have been covering the preserve, and the relatively few deer tracks have not revealed a consistent pattern. That in itself suggests buck group, and eventually in January I saw them: a huge buck, a good-sized but clearly subordinate forkhorn, and a newly minted buck fawn. Since that first sighting, I have spotted them twice more in widely separated parts of the preserve.
The boss buck
As I mentioned in an earlier post, the great horned owls’ nest tree of last winter was a casualty of the autumn’s controlled burn. My practice is to wait until mid-February to do the annual nest search. I had my inventory of candidate cavities, made last winter, but it didn’t take long to find the incubating female on last year’s red-tailed hawk nest. In a related note, I spotted a newly available candidate cavity along one of my monitoring routes. The top of an old oak recently broke off, leaving an open top of sufficient diameter that great horneds might consider it. A forest this old probably has some equilibrium of candidate cavities as old ones are lost and new ones form.
The new candidate nesting cavity
With that task out of the way, I decided to see if I could find a little nest in the area where the hooded warbler had his territory last summer. He has been a regular there in recent years, but as far as I know, no one has seen a female or young. I found that his territory has scattered bush honeysuckles and lots of Japanese barberries, bad for forest quality but probably good from the warbler’s viewpoint. Descriptions of hooded warbler nesting suggest that barberry would be an ideal platform. I didn’t find a nest, and ended the search when I found a dense thicket of barberries, with a few multiflora roses mixed in, at least 100 feet in diameter, worthy of Brer Rabbit.
Part of the thorny tangle
As I circumnavigated this patch, which is in a part of the forest with relatively dramatic surface relief, I noticed a few tipped trees whose fall had turned up rounded stones in the soil.
Rounded stones exposed by a tipped tree’s root tangle
This suggests that the preserve’s forested hills may in fact be kames, places within the melting continental glacier where the meltwater piled its flow-rounded stones into mounds. St. James Farm is very close to the western edge of the Valparaiso Moraine.
May 25, 2016 at 6:01 am (birds, restoration)
Tags: bald eagle, blue-gray gnatcatcher, Canada goose, double-crested cormorant, eastern bluebird, hooded warbler, least sandpiper, red-headed woodpecker, sharp-shinned hawk, St. James Farm
by Carl Strang
Birds poured into St. James Farm Forest Preserve in mid-May as the wave crest of neotropical migrants pushed through northern Illinois. On some days, sorting through the many songs to note visiting species was a challenge.
Not all were singing, though, for example this bald eagle that stopped in the restored stream corridor.
Blue-gray gnatcatchers are common on the preserve, and are among the earliest nesters.
I am hoping this hooded warbler, singing among the thicketed portions of the central forest, will find a mate and nest there.
I took that photo from a distance on a foggy day, not wanting to get too close and create a disturbance.
This sharp-shinned hawk was very vocal, its calls to my ear less like those of its relative the Cooper’s hawk and more like those of a shorebird.
At one point, heavy rains flooded the stream well beyond its banks.
The engineered restoration corridor held up well to the challenge.
Among the water-loving birds that took advantage of this temporary habitat expansion was a double-crested cormorant, here taking a break between swims.
After the water receded, the deposited mud interested a few late shorebird migrants, including this least sandpiper.
For other birds, the breeding season is well under way.
I am not sure where this goose brood came from, but they have found the restored stream corridor to their liking.
Among my happiest observations in the second half of May has been the discovery of two eastern bluebird nests in natural cavities.
Here the male stuffs food into unseen nestlings in a bur oak cavity.
Mom takes her turn. In just a few minutes I saw each parent make 3 such feeding trips.
The same story was repeated in a dead tree near the stream. I am relieved that not all bluebirds are dependent upon human-provided nest boxes.
A little earlier in their own cycle, a pair of red-headed woodpeckers has been setting up shop in another dead tree.
They have settled upon the lower of the two holes beside the foreground bird. (Clicking on any photo will blow it up for better viewing).
This pair energetically repelled another pair which expressed interest in their tree. I hope the other pair also will nest at St. James Farm.