Saturday, September 5, 2020

Usual suspects, Unusual Feathers

Captain Sam’s:

The morning started with a rush of new birds brought in on the western prevailing winds last night. Our first run of the day had 21 new captures and 2 recaptures. By the days end we processed a total 93 birds. Warbler diversity was excellent: 11 species. The species we captured most was the Common Yellowthroat with a total of 29 new individuals; our previous high count for this species was 6 on Sep 1, and our season total before today was 13 new birds. This influx indicates that migration is steadily making it’s annual south bound push.

There was one bird that caught everyone’s attention today though. A leucistic male Prairie Warbler surprised us with some pure white flight feathers. The primary coverts were entirely without pigment on both the left and right wings. Each wing also had a single white primary feather, but the irregularity was asymmetrical. This phenomenon is uncommon, and is caused by a minor mutation. This bird’s white feathers will deteriorate at a faster rate than normal but overall the health of the bird shouldn’t be affected.
Male After Hatch-year Prairie Warbler (Photo: VW)
Male After Hatch-year Prairie Warbler (Photo: VW)
Male After Hatch-year Prairie Warbler (Photo: VW)

 

 Little Bear:

As we prepared our coffee this morning and checked the radars, we saw that we were headed out for our first busy morning. Josh and I took off after we were all fueled up and popped open the nets ASAP. Our first run yielded us 21 birds. As the morning progressed, numbers started dropping run by run until late morning where things took a turn and we brought in about ten more birds on one of our last net runs. When it was all said and done, we had banded 76 new individuals for the day. We surprisingly didn’t even process a single recapture today. We of course pulled in a couple first of the seasons for Little Bear, which included an Ovenbird and a Veery. Both are expected species, but we definitely thought we would have already had an Ovenbird by now. Notably, we caught two more Worm-eating Warblers and another Yellow-throated Warbler! Both of these species were ones I had never seen in hand before so that was a real treat.

After Hatch-year Worm-eating Warbler (Photo: JL)

Hatch-year Veery (Photo: JL)


While aging a good ole Common Yellowthroat today, I made an uncertain observation about the usual feathers we take note of. I was looking at the alulas trying to find the typical molt limit on a Hatch-year warbler between the A1 and A2 feather when I noticed that this individual had what looked like two A2’s! This is something that none of us here at KIBS has ever seen before. Like Captain Sam’s post, this appears to be a genetic abnormality. A very fascinating one at that. 

Hatch-year Common Yellowthroat (Photo: JL)



  SpeciesCaptain Sam'sLittle Bear
NewRecapsNewRecaps
Great Crested Flycatcher
1
0
0
0
Eastern Kingbird
0
0
1
0
"Traill's" Flycatcher
3
0
7
0
White-eyed Vireo
2
0
3
0
Red-eyed Vireo
8
1
18
0
Carolina Wren
1
1
0
0
Veery
0
0
1
0
Brown Thrasher
1
0
0
0
Northern Mockingbird
0
0
1
0
Ovenbird
1
0
1
0
Worm-eating Warbler
1
0
2
0
Northern Waterthrush
2
1
6
0
Black-and-white Warbler
3
0
0
0
Prothonotary Warbler
2
0
1
0
Common Yellowthroat
29
0
17
0
American Redstart
9
0
6
0
Northern Parula
1
0
0
0
Yellow Warbler
2
0
1
0
Black-throated Blue Warbler
3
0
2
0
Yellow-throated Warbler
0
0
1
0
Prairie Warbler
13
0
1
0
Northern Cardinal
0
1
1
0
Painted Bunting
5
3
6
0



Today's Banding StatsCaptain Sam'sLittle BearTOTAL
# Birds Banded
87
76
163
# of Recaptures
7
0
7
# of Species
19
18
23
Effort (net-hours)
120
99.7
219.7
Capture Rate (birds/100 net-hours)
72.5
76.2
77.4
# of Nets
30
22
-




2020 Fall Cumulative Banding Stats Captain Sam'sLittle BearTOTAL
# Birds Banded
510
275
785
# of Recaptures
185
39
224
# of Species
33
32
42
Effort (net-hours)
2416.51
1133.95
3550.46
Capture Rate (birds/100 net-hours)
28.8
27.7
28.4
# of Days21
13
-



Banding Staff
Aaron Given (CS)
Sarah Mueller (CS)
Vincent Weber (CS)
Dan Errichetti (LB)
Kristin Attinger (CS)
Josh Lefever (LB)

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