Matching a Shed

by Carl Strang

On Thursday, as I was walking through the western edge of the forest at St. James Farm Forest Preserve, I looked down and saw this:

A recently shed left antler from a whitetail deer.

A recently shed left antler from a whitetail deer.

I had seen and photographed two different bucks over the course of the winter, and took the above photo in hope of finding a match. I had seen both individuals at different times near where I found the shed. The two bucks were quite different, one smaller and younger than the other.

The smaller buck clearly did not match. His left antler was smaller than the one I found, and had only two major tines in addition to the brow tine.

The smaller buck clearly did not match. His left antler was smaller than the one I found, and had only two major tines in addition to the brow tine.

The left antler of the larger buck had the same number of tines, and their proportions appeared to be the same as those of the shed one.

The left antler of the larger buck had the same number of tines, and their proportions appeared to be the same as those of the shed one.

The different angles provided by these views allow a comparison of the various tines’ contours.

The different angles provided by these views allow a comparison of the various tines’ contours.

I conclude that the larger buck, which I saw only on November 1, still is around and is the one who dropped the antler I found.

 

Concluding the Search

by Carl Strang

This year’s great horned owl nest search was the most intimidating I have done. There are 344 acres in the area I monitor, the portion of St. James Farm Forest Preserve that is north of Butterfield Road. A large portion of that acreage is forested, and it’s an old forest with many large trees that might harbor an owl nest. Furthermore, despite excellent restoration of the forest, a significant portion still has a difficult-to-negotiate understory dense with thorny barberries and roses mixed with way-blocking honeysuckles. Over a two-week period I went through the preserve, noting locations of candidate tree cavities and open tree tops.

One of the many possible nest cavities, large enough to hold an incubating owl that might not be visible from the ground.

One of the many possible nest cavities, large enough to hold an incubating owl that might not be visible from the ground.

Another candidate cavity. The weather often was gloomy, the limited light reducing photo quality and making it difficult to see if anything was inside.

Another candidate cavity. The weather often was gloomy, the limited light reducing photo quality and making it difficult to see if anything was inside.

There also were many old trees that had lost their tops.

There also were many old trees that had lost their tops.

Another example of a topped tree that could host a nest.

Another example of a topped tree that could host a nest.

After that initial survey, I decided to dig out my clunky old GPS unit and determine the latitude-longitude locations of all the candidate trees, while also mapping the survey routes I follow in routine monitoring work.

Here is the resulting map. I created a grid, the finest lines separated by one second of latitude or longitude. The blue dots and white lines mark my survey routes. The red dots are locations of trees that might harbor a great horned owl nest.

Here is the resulting map. I created a grid, the finest lines separated by one second of latitude or longitude. The blue dots and white lines mark my survey routes. The red dots are locations of trees that might harbor a great horned owl nest.

I was a little embarrassed by my failure to re-find 3 candidates from the descriptions in my notes. I ended up with 23 trees, and that turned out to be enough, as I saw this in one of them:

Sometimes a single feather tuft is all you get. In this case I could see part of the top of the head, too.

Sometimes a single feather tuft is all you get. In this case I could see part of the top of the head, too.

I realized that I was fortunate that this was a sunny day, and the additional ambient light made the difference. Now I look forward to following the progress of this nest. The eggs should have hatched by now.

 

SJF February Summary

by Carl Strang

Beginning in the middle of the month, I went through all of St. James Farm Forest Preserve seeking the great horned owl nest. I did not find it, but did create an inventory of 25 large tree cavities where an incubating owl might not be visible from the ground. An additional possibility would be a hawk nest in the dense top of one of the spruces. Twice I saw an owl, presumably the male if they are nesting this year, in the same north central portion of the main forest. In past observations elsewhere, the male usually perched in the vicinity of the nest. I will continue to monitor the suspect cavities, but may need to see branched young later in the season to narrow down possibilities further.

I was able to eliminate this cavity, as it was otherwise occupied.

I was able to eliminate this cavity, as it was otherwise occupied.

Some photo processing in the computer makes the raccoon easier to see.

Some photo processing in the computer makes the raccoon easier to see.

I had not seen or heard a pileated woodpecker on the preserve for more than 6 weeks (though occasionally I heard suspicious loud, spaced tapping sounds), but in the second half of February heard or saw one on three different days. The one close sighting was of a male.

The pileated’s tongue-spear in action.

The pileated’s tongue-spear in action.

American coots and large numbers of mallards were a continuing presence on the stream. For much of the month the Canada geese roosting at Blackwell frequently passed over St. James Farm in large numbers, occasionally stopping to graze the lawns and meadow areas. Geese began to break off into pairs as ponds opened up during the last third of February. Interesting bird sightings included a bald eagle flying over, and a hermit thrush on February 16. Migrating sandhill crane flocks began to pass over beginning on the 21st. A small group of white-throated sparrows in the eastern part of the main forest were the first observed on the preserve this year. The first red-winged blackbirds arrived, and eastern bluebirds became a more consistent presence in the last part of February.

This male eastern bluebird seemed to be staking a claim in a corner of the grounds adjacent to a pair of bluebird houses.

This male eastern bluebird seemed to be staking a claim in a corner of the grounds adjacent to a pair of bluebird houses.

Fox squirrels fed heavily from Norway spruce cones in the south forest, and on tree buds elsewhere. Skunk and deer activity was much as described for January. The preserve’s deer minimally are a group of 3 does, a group of 2 deer which occasionally associate with those does, and a single buck. The snow was never deep enough to discourage raccoons. A mink used a den off the south edge of the pond in the preserve’s northwest corner.

Along the way during the owl nest search I found this curiosity.

Along the way during the owl nest search I found this curiosity.

The deer pelvic bone was well gnawed by rodents.

The deer pelvic bone was well gnawed by rodents.

The bone has been on this buckthorn twig long enough for the twig to grow several long branches.

The bone has been on this buckthorn twig long enough for the twig to grow several long branches.

The large area of restoration brush clearing in the main forest was expanded greatly by District staff, generally following the route of the new trail mapped in the preserve’s master plan. Among the more interesting plants encountered during the owl nest search were two of the most massive black walnuts I have ever seen, and a prickly-stemmed greenbrier (Smilax tamnoides).

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