Edwin Way Teale once wrote about revisiting a favorite wild place after a long absence:
"On a return to old familiar scenes, it is remarkable how remembered trees seem to step forward to meet you in a landscape...they are landmarks of special importance. We look over the old trees as we do our dear friends and acquaintances to note the changes that the years have brought."
Similar thoughts were passing through my mind as I neared a long-time favorite forest preserve near Chicago following several years of absence. For quite a few years beginning in the mid-1980s and before moving to southern Illinois, I had been a regular, almost weekly, visitor to the natural areas near Spear Woods. During this time, I had established a fairly regular route through the woods and fields, mostly following animal trails. Many of my hikes began just after sunrise when few other humans were about. A large white oak tree marked the furthest point on most hikes; after sitting for a while against the oak, I would usually begin to head back to the trail head on 95th street. As I left my vehicle in the preserve parking area on this return October visit, I could clearly envision the old oak. Little did I know that a big change had occurred during my extended absence.
An Outdoor Education
Like most previous hikes, I followed a frequently used deer trail on the way to my favorite white oak tree, passing near Pollywog Slough. Because of the frequency of my former visits to the Spear Woods area, I had become extremely familiar with the lay of the land, the different bird species to be found at all seasons, and the timing of their migrations. After a while, I even became familiar with individual plants along the trails. At the northernmost point of Pollywog Slough is a stand of prairie cordgrass, which, probably because of its rarity in the area and its association with wild, uncultivated land, has always seemed to provide me with a vague sense of security for the future of the natural world; how long it has been there, no one can ever know.
Walking past the slough, I remembered that prior to the drought of 1988, the slough was mostly open water. Since the drought, it has become overgrown with plants, mostly cattails. The drought seems to have pushed ahead the natural plant succession tending toward a forest. On a previous trip, when there was still much open water at the slough, I had watched the complicated flights of numerous barn and rough-winged swallows picking insects from the air and off the water’s surface. I recalled how the late afternoon sunlight reflected from the barn swallows’ feathers, making the tops of their bodies a deep blue, richer in quality then the early evening sky of a clear Canadian high.
Hogwash Slough was my next stopping place on the trail toward the old oak tree, and a rotting log covered with mosses provided a good vantage point to watch for birds over the water. One spring there was a yellow-crowned night heron perching on the top of a dead tree, perhaps on its way to the heronries of the Lake Calumet wetlands. And once during the fall hawk migration, I watched an osprey flying from the north; the bird circled over the slough a few times, then dove into the water, emerging a few seconds later with a small fish in its talons. The osprey then perched on the top of a dead tree and fed on the fish for several minutes before continuing southward. I remembered summer months with red-headed woodpeckers and cedar waxwings flying back and forth over the slough catching insects from the air, while from time to time a belted kingfisher hovered over the water, its body seemingly anchored to a point in the air. Though I had been using this same log for years, a large clump of the non-native multiflora rose now grew in front of the log, obscuring my view of the slough. On future hikes I would have to find a new log.
North of Hogwash Slough, I followed the deer trail to an old field containing a great deal of scrubby vegetation in addition to several good-quality prairie plants: wild false indigo, wild quinine, prairie dock, and stands of big bluestem grass. It was at the meadow years ago that I first saw the old oak tree after topping a slight rise in the land. In my mind’s eye, I could see its wide, open crown and large lower branches, indicating that as long as this tree was alive, the surrounding area was open with few other trees. A tree that grew to maturity in a closed-canopy forest would have had its lower branches fall away through a process of "self-pruning."
Early on I had begun to use the tree as a good place to sit, listen to the wind and birds, read, and sleep. I returned often, once to find a large bird fly from the ground on my approach in order to land on the tree’s lowest branch. Slowly the bird turned its head, and I found myself face to face with a great horned owl; its eyes seemed to indicate boredom at my presence rather than alarm. I half expected the owl to rush at me with extended talons, against which I would have been defenseless; instead, it quickly disappeared into the forest without a sound.
Most days at the tree had been somewhat less eventful. Summer days in the shade were filled with soothingly warm breezes accompanied by the continuous songs of common yellowthroats and goldfinches, occasionally a blue-winged warbler. During the winter I sometimes sighted a northern shrike or American kestrel. And in all seasons the skies usually contained soaring red-tailed hawks, some of which engaged in courtship displays beginning in late winter.
Sometimes there were mats of grass near the tree flattened from white-tailed deer resting in the night. Signs of deer are very common, from frequently encountered piles of their droppings to scattered bones. The deer, in fact, are highly overpopulated in the Cook County forest preserves. With few natural predators to check their numbers, a population boom and bust cycle may be inevitable.
As I walked toward the old oak tree on this most recent visit, I remembered these and many more experiences, and the promise of a new adventure caused me to walk a bit faster than usual. Would I see an owl on this day? A northern shrike? Or maybe a coyote, known to have increasing populations in Illinois? The answers were just over the next rise, beyond a line of oaks.
[Note: This story originally appeared in slightly different form in the Summer 1996 issue of Illinois Audubon magazine, Number 257.]


