Nickname
023-A-002 (Knowlton Township Bldg)
Coordinates
(40.9317, -75.0894)
Substrate
Communication tower
Description
Columbia cell tower.
Followers
None
Monitoring groups
What to look for
a
Adult Arrival
Look for 2 adults on the nest. The adult pair will show pair bonding behaviors such as vocalizations, aerial sky dances, and the male feeding the female fish. You may see the pair copulating, which typically begins 14 days before laying eggs.b
Incubation Initiation
Females will lay 1 - 4 eggs at a rate of one egg every 1 - 2 days. After laying, incubation starts. Look for adults taking turns sitting low in the nest incubating eggs. The incubation period can last 35 - 43 days.c
Clutch Hatching
Chicks hatch ~39 days after incubation begins. Look for adults bringing food to the nest and making "head bows" into the center. Chicks typically can't be seen until they are 2 - 3 weeks old, so feeding behavior is the only way to know chicks are there.d
Nestling Count
Around 4 weeks after hatching, look for the heads of chicks to show over the rim of the nest, particularly when adults bring food to the nest. Other times they lie flat and are harder to see. Count the number of chicks in the nest before they learn to flye
Fledgling Count
Chicks begin flying around 7 - 8 weeks old, and are still fed by the adults. Count the number of chicks who have successfully fledged the nest and are observed flying.f
Chick Last Observed
4 - 10 weeks after fledging, chicks begin leaving the nest area to migrate south, once they have learned to fly and feed themselves. Record the date that the last chick left the nest.x
Nest Failure
Look for signs of nest failure like adult abandonment, adults no longer incubating eggs or feeding young.Review All Observations
| 2021 - CyclistBarb | 2020 - CyclistBarb | |
|---|---|---|
| aAdult Arrival | ||
| aOccupied | No | No |
| aActive | ||
| bEgg Laying | ||
| bIncubation Initiation | ||
| cClutch Hatching | ||
| dNestlings | ||
| eFledglings | ||
| eFirst Chick Fledging | ||
| fChicks Last Observed | ||
| xNest Failure | ||
| xReason For Nest Failure |
Select Seasons
Show reports, diaries, and photos from:Current 2022 2021 2020
Activity reports
2020 Nest Activity Report by CyclistBarb
| Adult arrival | Nestlings | ||
|---|---|---|---|
| Nest Occupied | No | Fledglings | |
| Nest Active | First chick fledging | ||
| Egg laying | Chicks last observed | ||
| Incubation initiation | Nest failure | ||
| Clutch hatching | Reason for nest failure |
2021 Nest Activity Report by CyclistBarb
| Adult arrival | Nestlings | ||
|---|---|---|---|
| Nest Occupied | No | Fledglings | |
| Nest Active | First chick fledging | ||
| Egg laying | Chicks last observed | ||
| Incubation initiation | Nest failure | ||
| Clutch hatching | Reason for nest failure |
Photos of this nest
Nesting Diaries
08/05/2022 by CyclistBarb
9:15 a.m. When I arrived I saw at least half dozen ravens perched and flying around the tower, but no eagles! I spoke with Doreen at the township offices. She was sure she saw eagles yesterday and was very excited at the prospect of having nesting eagles near her office! I gave her an osprey brochure as I had already given her an eagle brochure when I gave her my card.
Doreen wrote to me at 10:53 a.m. that the eagle pair was at the nest. I was already at the osprey nest on Strykers Rd by the time I read the email. I requested that she send a phone photo next time she sees them at this nest, even if the photo isn't so sharp.
08/04/2022 by CyclistBarb
8:30 a.m. I received a call from Doreen at the Knowlton Twp building. She said there were at least three eagles at the nest on the tower! She said there may have even been a fourth flying around the area. These eagles might be two pair, and one of the pair has built a "housekeeping nest" on what had been an osprey tower! I will keep my eyes on what unfolds! It is an odd time of year for nest building!
07/31/2022 by CyclistBarb
9:30 a.m. Parked in the Municipal lot again for a bike ride. No sign the nest had been built up further and I did not see or hear any birds on or near the tower.
07/26/2022 by CyclistBarb
2:15 p.m. After doing osprey nest checks in northern Warren County, I rode my bike in the area. We always meet and park in the large lot behind the Knowlton Municipal Building. As we finished the ride and were passing by the tower, I was shocked to see what appeared to be large birds on the posts and a nest on the second tier!!
Every year since I began surveying northwest Jersey osprey nests, I have checked this tower, and had never seen signs of any nest material nor any birds near the tower.
I set up my scope and sure enough, there was nesting material there although the nest did not look large nor "complete." The "birds" that I thought I could see either flew off, or I mistook part of the structure for a large, dark bird.
We meet in this parking lot to ride in the area quite frequently. In additon I drive right past this tower every time I do an eagle nest check in the water gap area--at least once a week. I always look at the tower! However, since mid-June I have not paid much attention to it since I had never seen any sign of nesting there.
I spoke with a woman (Doreen) who works in the building and goes out behind the building to smoke. She said about 3 weeks ago they were noticing large bird(s) carrying big sticks to the tower! Lately, this activity has not been observed. She seemed to feel that it was only about 3 weeks ago that the activity was initiated, and, indeed, on May 10 when I took my 2022 report photo, there was no sign of any nest material. This is very late for ospreys and eagles to be nest building. It must be a new pair building a "housekeeping" nest. It will be interesting to see what happens next season.
Doreen was not clear as to the type of bird, just that it was very large and carrying huge long sticks! Strangely, as we cycled into the parking lot, I heard an adult eagle calling (but not toward the tower, toward the other side of the building) but could not locate it in the dense foliage. I doubt an eagle would build a nest on the second tier of a tower. It is more likely ospreys that brought in the sticks!
05/10/2022 by CyclistBarb
9:28 a.m. For as long as I have been watching nests in northwest NJ, this tower has not had any nesting material on it, nor any ospreys present and perching nearby.
07/05/2021 by CyclistBarb
I have been by this tower numerous times during the past two years as we often park at the municipal center to begin bike rides in the area. I have not seen any evidence of osprey nor any nesting materials on this tower.
04/27/2021 by CyclistBarb
This tower is still void of any nesting material. Apparently it is not being used any more.
08/21/2020 by CyclistBarb
Every time I exit route 80 and drive to the Linaberry, Mt Hermon, and/or Hardwick Municipal Bldg nests I pass this tower. I continue to confirm there are no osprey present this year.
07/04/2020 by CyclistBarb
3:00 p.m. Had occasion to drive past this tower again and still saw no nesting or osprey present.
06/21/2020 by CyclistBarb
11:50 a.m. I saw no sign of any nesting material in this tower, nor any adult osprey in the area.