Sunday, July 22, 2012

Midsummer Birds

19 June- 14 July

The second half of June was quiet for a time but with the onslaught of baby birds our numbers tripled by the beginning of July. It is then a mad rush to get babies banded and back to the spot where they were captured to reunite with their parents. They were emerging at my home too and I just had to share these adorable photos of a recently fledged Carolina Wren. It sat on the steps not quite knowing what to make of me and my camera. Notice the downy feathers on top of the head. So cute!


Back on the island we had numerous HY (hatch year or first year) birds on June 16- robins, chickadees, Carolina Wrens, and our first Hairy Woodpecker and Tufted Titmouse (shown below).

Notice the lime green ring around this young bird's eye which will darken to gray as the bird ages.

Most of our Northern Cardinals are aged AHY or after hatch year in the spring, which means banders know the bird is not a young bird but we can't age it past the previous year. Our female cardinal had retained two juvenal secondary feathers allowing us to age her as SY (second year) meaning she was born last year. Many cardinals will go through a complete molt in their first year but occasionally we get lucky and find molt limits in the wing as below. The two secondary feathers are shorter and browner than the feathers on either side of them.

Flocks of starlings were visible flying over the fields and salt marsh on June 24th. I always cringe when they get close to a net and say a silent prayer that I won't find it full of starlings! We captured only 3 thank goodness, all HY birds. Young birds have grayish-brown plumage and we can sometimes sex them by the color of the eye; dark brownish gray for males and grayish with a yellow tinge for females, but I didn't feel comfortable assigning sex to this bird so I sexed it unknown. The eye color seemed to fall somewhere in between. 

This bird had a severe case of cloacal flukes, a parasitic flatworm that causes this appearance around the cloaca (or vent- the opening for reproductive and excretory systems of a bird), so I'm not sure this bird will survive.  

We captured a chickadee who still had the bright yellow gape of a very young bird. Babies have bright yellow mouths to make it easier for the parents to feed them.

Other first HY's for our summer season on the 24th were a very buffy looking Song Sparrow

and a House Finch of unknown sex. 

Most of our adult Yellow Warblers have finished breeding and are going through complete molts before heading off to their wintering grounds.

This SY femalewe captured on the 29th was molting her inner primary feathers, corresponding primary coverts, and secondary or greater coverts.

Also molting was this HY Hairy Woodpecker replacing only his primary feathers.

Young birds have grayish brown eyes and in males the red on the head extends in front of the eyes. 

For some reason we don't capture many White-breasted Nuthatches even though we hear them almost every day we are banding. We caught this male also on June 29th.

 Pyle states that males can develop partial brood patches which indeed was present on this bird.  

On July 7th we caught the female who had finished breeding and her belly feathers were growing back in. The head and nape feathers on females are a dull black or grayish color compared with the jet black on the male above.

Most of the young Yellow Warblers we capture at this time of year can't be sexed but occasionally we can assign sex to the bird if we see red streaks on the breast such as this young male.

Ovenbirds have begun their southerly migration already, we've had three so far this month.  



Our first HY Baltimore Orioles were captured on July 11th. We sexed her as a female due to her short wing.

On the 14th we captured a very young Common Yellowthroat  whom we aged as  L for local, meaning the bird is unable to sustain flight.

We also captured this young chickadee that had gone through some kind of nutritional difficulty as the feathers were just emerging. The bird has a striped appearance to the feathers 

 and if you notice the tips of the tail feathers also have uneven growth bars.

The Bird Banding Lab contacted me recently about three of our birds found by others. One was a Carolina Wren banded by Gretchen as a HY bird on 2 July 2010. The bird was found in a house on Smith Lane in Eastham, a town nearby, on April 6th.

On the 21st of June a Myrtle Warbler, similar to the bird pictured below, was found in Bridgewater, Nova Scotia.

Sadly, the bird was found dead but still it is exciting when we hear about our birds being found in different areas. The distance between the two sites is approximately 337 miles as the crow flies, or I should say as the warbler flies!!

Lastly , a Common Yellowthroat I banded on 13 August 2011 as a young bird was recaptured and released unharmed at Manomet's banding station this past May 24th.

Speaking of recaptures we had a couple of significant encounters of birds previously banded by us during this time frame- a 6 yr old American Goldfinch and a 9 year old Prairie Warbler. This picture of the Prairie was taken in 2010 during his yearly molt. We've captured him every year except 2005.

As always many thanks to those who put in many volunteer hours helping at the banding station including Ben Lagasse, Judith Bruce, Carolyn Kennedy, Gretchen Putonen, Jessica Rempel, and Judy Keller. The following is a list of birds seen, heard, or banded during this time period. 

Total birds: 298                             Total species: 53
Total banded species: 23                Birds/100 net-hours: 42


Double-crested Cormorant
Great Blue Heron
Great Egret
Green Heron
Osprey
Northern Harrier
Red-tailed Hawk
Semipalmated Plover
Killdeer
Willet
Laughing Gull
Ring-billed Gull
Herring Gull
Great Black-backed Gull
Common Tern
Mourning Dove
Ruby-throated Hummingbird- 1 new
Belted Kingfisher
Downy Woodpecker-  6 new
Hairy Woodpecker-  2 new
Yellow-shafted Flicker-1 unbanded
Eastern Phoebe
Great Crested Flycatcher
Tree Swallow
Barn Swallow
Blue Jay
American Crow
Fish Crow
Black-capped Chickadee-  42 new; 12 recaps; 1 unbanded
Tufted Titmouse- 1 new
White-breasted Nuthatch- 2 new
Carolina Wren-   9 new; 3 recaps
American Robin-  14 new; 5 recaps; 5 unbanded
Gray Catbird-   31 new; 23 recaps; 1 unbanded
Northern Mockingbird- 1 new
Cedar Waxwing
European Starling-  5 new, 1 unbanded
Yellow Warbler- 12 new; 2 recaps
Pine Warbler
Prairie Warbler- 2 new; 3 recap
Ovenbird- 3 new; 1 recap
Common Yellowthroat-  25 new; 29 recaps; 3 unbanded
Northern Cardinal-  7 new; 1 recap
Eastern Towhee-  1 new; 2 recaps
Saltmarsh Sparrow
Song Sparrow- 14 new; 12 recaps; 3 unbanded
Red-winged Blackbird-  1 new; 1 unbanded
Common Grackle
Brown-headed Cowbird
Baltimore Oriole-  5 new
House Finch-  4 new
American Goldfinch -  3 new; 1 recap
House Sparrow- 1 new

Tuesday, June 26, 2012

The End of Spring Migration

26 May- 16 June

We banded another two days in May  and four days in June to complete the spring season. I was away for a spell in early June so didn't get out as often as I'd hoped, plus weather wasn't cooperating. We banded our FOY (first of year) adult male Cedar Waxwing on the 28th

and Alice, a very enthusiastic high school student, was eager to release this gorgeous bird.

We captured two Saltmarsh Sparrows on 1 Jun, both in the same net. One was an obvious male due to a very enlarged cloacal protuberance but the other one was either a non breeding male he was chasing away or a female he was attracted to! The definite male was a bit brighter than the other one.

I was unable to age this bird past AHY (after hatching year). I could see a molt limit in the secondaries, it appeared he had replaced s6, however according to Pyle they can molt s6 again during the prealternate molt in the spring. I'm leaning toward ASY in this bird as the primary coverts seemed broad with a distinct edging.

The Carolina Wren we captured this day was easier to age as a SY (second year) bird with two retained juvenal primary feathers (pps 1,2). The first secondary feather (s1) is right above my finger and the two retained primary feathers are right above that. Notice the streaks aren't as bold as those on the replaced feathers and the shafts of the juvenal feathers are a lighter color too. 

Our first Great Crested Flycatcher for 2012 was banded on 7 June, a female based on an extensive brood patch and a short wing chord. Females will drop their breast and belly feathers to impart warmth to their eggs as they incubate. In some species males will develop brood patches (BP's) too and this is the case with Great Cresteds , although the BP isn't as extensive in males.

Our first baby birds (HY or hatch year) were captured on the 16th- a robin,

two Carolina Wrens,

and a male Downy Woodpecker. The red on the top of the head are juvenal feathers that will be replaced during the 1st prebasic molt when the red feathers will show up on the back of the head. This bird was already beginning his molt replacing his first three primary feathers.

June 16th was our last day of spring migration monitoring. Overall, this was our worst spring season when comparing effort to previous years. We missed a number of species  we usually catch each spring- Common Grackle, Ruby-crowned Kinglet, no flycatchers at all including Eastern Phoebe and Eastern Kingbird, or numerous warblers- Northern Parula (although I heard it), Black-throated Blue, Blackpoll, Ovenbird (also heard), and American Redstart.  We had very low numbers of new birds for some of our resident birds- Blue Jay (1), Black-capped Chickadee(4), and Song Sparrow(7). We banded a measly 264 new birds. While Wing Island is great in the fall, I'm really considering looking for a new place for spring migrants, maybe back to the Punkhorn, although I'm sure some of my volunteers wouldn't be too eager for that (very buggy and rough terrain). We recaptured more birds previously banded than new birds- 267. Of those, 121 were birds returning from previous years. Our oldest bird was a 10 year old female Common Yellowthroat first captured in 2002. She then eluded us for 7 years recapturing her again in 2009, then 2010, and again this year. We also had a 9 year old Gray Catbird, an 8 year old Common Yellowthroat, four 7 year olds (Gray Catbird, American Goldfinch and 2 Song Sparrows), one 6 year old Black-capped Chickadee, and the rest were five years of age or younger.
The highlights of the season were capturing our very first Wood Thrush

and adding a few new species for our spring list; Veery, Brown Creeper (pictured below)

and Field Sparrow.

Many thanks to all who helped out this spring: Jo-Anna Ghadban, Gretchen Putonen, Alice Wynn, Jessica Rempel, Ben Lagasse, Carolyn Kennedy, and Judy Keller.

Below is list of birds seen, heard, and captured (with numbers) throughout the spring monitoring season.
 
Total birds: 274                                    Total species: 89
Total banded species: 45                      Birds/100 net-hrs: 24

Great Blue Heron
Green Heron
Brant
Canada Goose
American Black Duck
Mallard
Turkey Vulture
Osprey
Cooper's Hawk
Red-tailed Hawk
Northern Bobwhite
Black-bellied Plover
Killdeer
Greater Yellowlegs
Solitary Sandpiper
Willet
Spotted Sandpiper
American Woodcock
Laughing Gull
Ring-billed Gull
Herring Gull
Great Black-backed Gull
Common Tern
Mourning Dove 1 unbanded
Great Horned Owl
Ruby-throated Hummingbird 3 new
Belted Kingfisher
Red-bellied Woodpecker
Downy Woodpecker 2 new; 2 recaps
Hairy Woodpecker
Yellow-shafted Flicker
Eastern Phoebe
Great Crested Flycatcher 1 new
Tree Swallow 1 new
Barn Swallow
Blue Jay 1 new
American Crow
Fish Crow
Black-capped Chickadee 4 new, 61 recaps, 1 unbanded
Tufted Titmouse 2 new, 11 recaps
Red-breasted Nuthatch
White-breasted Nuthatch
Brown Creeper 1 new
Carolina Wren 3 new; 22 recaps, 3 unbanded
Golden-crowned Kinglet
Eastern Bluebird
Veery 1 new
Swainson's Thrush 1 new
Hermit Thrush 5 new, 2 recaps
Wood Thrush 1 new
American Robin 4 new
Gray Catbird 78 new, 25 recaps,1 unbanded
Northern Mockingbird 1 new
Brown Thrasher 2 new, 1 recap, 1 unbanded
Cedar Waxwing 4 new
European Starling
White-eyed Vireo 1 new
Nashville Warbler 3 new
Northern Parula
Yellow Warbler 3 new
Magnolia Warbler 2 new
Myrtle (Yellow-rumped) Warbler 5 new
Black-throated Green Warbler
Pine Warbler 2 new 2 recaps
Prairie Warbler 7 new, 1 recap
Yellow Palm Warbler 6 new
Blackpoll Warbler
Black-and-white Warbler 2 new
Ovenbird
Northern Waterthrush 2 new
Common Yellowthroat 24 new; 61 recaps; 2 unbanded
Wilson's Warbler 1 new
Northern Cardinal 9 new, 9 recaps, 1 unbanded
Eastern Towhee 5 new; 1 recap
Chipping Sparrow
Field Sparrow 1 new
Savannah Sparrow 1 new
Saltmarsh Sparrow 2 new
Song Sparrow 7 new, 50 recaps, 2 unbanded
Swamp Sparrow 9 new
White-throated Sparrow 14 new, 5 recaps
Red-winged Blackbird 4 new
Common Grackle
Brown-headed Cowbird 5 new; 1 recap, 1 unbanded
Orchard Oriole 1 new
Baltimore Oriole 1 new
House Finch
American Goldfinch 28 new, 13 recaps
House Sparrow 4 new