Hummingbirds and Hurricanes

Ruby-throated Hummingbird male.

This morning I helped trap hummingbirds for banding at Seven Islands State Birding Park in east Tennessee where local Ruby-throated Hummingbirds are preparing for migration and others are stopping to feed enroute to their wintering grounds in Central America and Southern Mexico.  At the same time, three hurricanes are churning in the south Atlantic, and as I write, hurricane Irma, originally a category 5 hurricane that has devastated many islands in the Carribean, is barreling down on Florida.

Above, Mark Armstrong demonstrates hummingbird banding at Ijams nature center, with Janie Kading assisting.

Knowing that Ruby-throated hummingbird migration is in full swing, I have wondered how these hurricanes have affected their migration.  I asked my friend and east Tennessee hummingbird expert, Mark Armstrong, to share what he knew about storm affects on migration. He answered with these comments:
"Unfortunately I don’t know much about their [hummingbird] survival in a storm.  I’ve heard of birds making landfall on the fringes of other storms and arriving thin and exhausted.  I’ve also read that migration from an evolutionary standpoint is actually across a broad front and a prolonged period so that some part of the population may be affected by adverse weather the majority will not be and survive.  I also keep thinking about Dr. Buehler’s Golden-winged warblers. They were at their breeding territories, left when tornados were heading their way, some went to the Gulf coast and one went back to Cuba.  Then they returned to breeding territories after the threat passed.  That is amazing and we really don’t know what birds may be perceiving and if they are capable of moving away from a danger like a hurricane.  Any small bird I can’t imagine would survive a direct hit from a storm with extremely high winds."

I, for one, am glad that the local hummingbirds frequenting my yard are hanging around and hope they will wait to leave until the many storm threats pass.

Meanwhile, we had a fun surprise during our banding session this morning at Seven Islands.  You may think that the hummingbird pictured above is a mature male Ruby-throat.  But surprise--this is a juvenile!  Normally, we expect to see juvenile males in their first year with scattered red throat feathers like the one pictured in image three or we might see small clusters of three or four red feathers as their gorget begins forming.

This first year male had an almost fully formed gorget, which Mark described as a rare occurrence in his experience.  Mark has banded over 4000 Ruby-throated hummingbirds since he began banding hummingbirds in 2005.  The juvenile pictured had white tail feather tips and other attributes that are the identifying characteristics of juveniles.

Most of our hummingbirds will leave Tennessee by the end of September with some late individuals departing by the second week of October.  Remember to leave at least one feeder out to feed our wintering hummingbirds that come from the west.  These birds often arrive from October to December.  If you should have a hummingbird at your feeder after November 1st, contact Mark Armstrong at Woodthrush@bellsouth.net or 865-748-2224.

Photo credit for banding images:  Mark Armstrong
Why do we band hummingbirds?
Mark Armstrong and banding at Seven Islands
Wintering Hummingbirds in Tennessee
Seven Islands State Birding Park

Bird Banding Surprises at Seven Islands State Birding Park

Bird banding at Seven Islands State Birding Park sometimes brings surprises.  Our banding session on March 27th, brought a special one.  An American Woodcock was the first bird captured in our nets.  

Above, Master Bander, Mark Armstrong holds the woodcock so the rest of the banding team can see him/her before release.

Mark described the woodcock's beak as "soft as a noodle" while he was removing him/her from the net, but as soon as he was free, the beak hardened again.  The woodcock's beak is specially adapted for finding and digging earthworms in the forest floor.

This quote from Birds of North America describes some of the woodcocks unique qualities:  "Several features help to distinguish this forest-dwelling shorebird from its more aquatic relatives (Scolopacidae): a long bill specialized for feeding on earthworms, a stout head with large eyes set far back for rearview binocular vision, a polygynous mating system, sexes monomorphic in color with females substantially larger than males, and plumage with mottled, leaf-brown patterns that blend superbly with the forest floor. Indeed, the body and behavior of this woodcock have given it many colorful vernacular names such as timberdoodle, Labrador twister, night partridge, and bog sucker."

The Woodcock is a game bird so we did not band or record this capture, we just admired it and released.  No one expects to see a woodcock at such close range and this was quite a treat for all of us!

In addition to the their "penting" call during courtship, the male woodcock makes a rushing sound with its outer flight feathers.

Most of the rest of our banded birds were goldfinches, sparrows, cardinals and chickadees, but we did have one special catch at our last net run--a beautiful male Tree Swallow!

Tree Swallows have just returned to east Tennessee from their wintering grounds and they were flying in groups, all around the area, checking out the nest boxes.

It was delightful to listen to their calls and hear their chattering as they landed on the nest boxes and considered their options.  Seven Islands has a nest box trail of about 50 boxes that provide homes for chickadees, wrens, swallows and bluebirds.

To see more posts on Seven Islands bird banding, click the link.

Migration Season--Fall Banding at Seven Islands

This is the second in a two-part series on the October 11th banding session at Seven Islands State Birding Park, Tennessee, with Mark Armstrong and Billie Cantwell banding.  The first post can be found at this link:  A Palm Warbler Kind of Day 

Photo credit:  Patty Ford

Fall is always an exciting season as migrants are moving through the area and wintering species are just arriving.  Seven Islands provides a unique and exciting habitat for studying birds.  Situated on more than 410 acres along the French Broad River, the park offers a combination of shrubby and native grassland habitat with food sources that attract many migrating warblers, wintering sparrows and other species.    

Above, a female Hooded Warbler.    Hooded warblers breed in eastern North America, including Tennessee, and winter in the West Indies, Mexico, to Panama.  They live and forage in low, dense understory, often near water.   Photo credit:  Colin Leonard

Nineteen species were processed during the banding session with a total of 122 birds banded and 12 recaptures (birds previously banded), totaling 134.  Among the warblers and sparrows banded were 13 Common Yellowthroats, 1 Magnolia warbler, 57 Western Palm Warblers, 1 Yellow Palm Warbler, 1 Hooded warbler, 17 Field Sparrows, 1 Chipping Sparrow, 2 Savannah Sparrows, 6 Swamp Sparrows and 5 Song Sparrows.

Members of the banding team go to the nets to extract birds at regular intervals beginning at 7:40 a.m. with the period for banding lasting until approximately 11:00 a.m. depending on weather conditions.  When captured, each bird is placed in a small cloth bag while waiting to be processed. The bag helps keep the bird calm and safe until it is banded and set free again.

Above and below, images of a male Magnolia Warbler (Setaphaga magnolia). Magnolia Warblers breed in northern boreal forests and migrate to wintering grounds in Mexico and the West Indies to Panama.  Their conspicuous bright yellow and black breeding plumage with distinct tail markings make them one of the most easily recognized warblers.  The Magnolia warbler you see here is in his fall or non-breeding plumage.  Black markings around his face have faded to gray, as well as the streaked black necklace that is present during breeding season.

The distinctive band of white in the outer tail feathers of the Magnolia Warbler is shown above and is unique to this warbler species.

Magnolia Warblers also has a bright yellow rump which often causes them to be confused with the Yellow-rumped Warbler, but their bright yellow breast is an obvious distinction between species..  

Above and below, Magnolia Warbler    

Banding team members return from the nets to bring birds back to the banding station.

Below, taking a break between net runs.

Above, Billie Cantwell places a band on an Indigo Bunting.  Birds are banded and then examined for information that helps to identify their age, sex, and relative health at the time they were captured.

Wing measurements and tail measurements are taken.

If it is possible to determine the sex of the bird, this information is also recorded, along with the amount of fat found on the bird's belly.  A large amount of fat during migration indicates a healthy, well-nourished bird.    

All of the data collected is recorded on a banding sheet, shown above, and will be reported to the United States Geological Banding Laboratory.   Photo credit:  Colin Leonard

Age is determined by examining the wing feathers, including colors, length, and relative wear.  The skull is also examined for ossification. Photo credit Colin Leonard

Above, you see the wing of an Indigo Bunting.  The bird is being held in a "banders grip" during examination. This grip supports the birds body while it is being examined. Photo credit: Colin Leonard

In the image above, Mark Armstrong is about to touch an Eastern Phoebe's bill, but he gets a surprise. The phoebe snaps his beak making a loud clap. Phoebes are known to snap their bills during aggressive territorial interactions with other phoebes.  

Birds have personalities and it is particularly delightful when they express them!  Mark Armstrong is a Master Bander of songbirds and hummingbirds.  He is the founder of East Tennessee Avian Research, a non-profit organization, and has been operating the banding station at Seven Islands for approximately eight years.

Eastern Phoebe                      Photo credit:  Colin Leonard

Visit the first post in this two-part report on banding:  A Palm Warbler Kind of Day

Visit my previous posts on bird banding

Bird Banding at Seven Islands State Birding Park

Knoxville Chapter, Tennessee Ornithological Society

Visit the Knoxville Chapter of TOS on Facebook

Seven Islands State Birding Park

Seven Islands Wildlife Refuge now Seven Islands State Birding Park

A Palm Warbler Kind of Day--Banding at Seven Islands

Banding at Seven Islands State Birding Park in the fall can be spectacular and our banding session on October 11th was just that.  122 birds were banded and 12 recaptured for a total of 134 birds processed by a great banding team.

Photo credit:  Colin Leonard

Among the 19 species banded, 58 were Palm Warblers!  I am focusing this post on this beautiful species and will show you more species in a second post to follow.

Palm Warblers (Setophaga palmarum) breed in bogs and fens of remote boreal forests of the northeast and are considered one of our most northerly breeding wood warblers.  Migrating at night in small flocks, they winter in the southeastern and Gulf coast states, Mexico and the West Indies.  

Photo credit:  Colin Leonard

Our banding session was timed just right to capture this species during migration. They are found at Seven Islands because they like foraging on the ground in grassy and weedy areas and on small shrubs and trees, all plentiful in the park.

Above, a Western Palm Warbler, held in a bander's grip, showing rufous feathers on his head.  The male Palm Warbler wears a rufous crown during breeding season and the visibility of rufous feathers this time of year indicates a male that has molted into winter plumage.

Above and below, Western Palm Warblers (also known as brown).

There are two subspecies of Palm Warblers, the Western Palm Warbler, also referred to as brown, and the Yellow Palm Warbler or Eastern subspecies.  Among our 58 Palm Warblers, we captured one Yellow Palm Warbler which gave us an excellent opportunity to compare the difference.

In the image above, you can see a comparison of the lores (eyebrow area) and throat of the two subspecies of Palm Warblers.  The Western subspecies has a more buffy appearance with buff-colored lores while the Yellow Palm Warbler has yellow lores, throat and belly, shown below.  Photo credit:  Colin Leonard

Above, the Western is on the left and the Yellow subspecies or Eastern on the right. The yellow tail coverts on this species are also distinctive field marks.  In the field, the Palm Warbler is often seen pumping its tail while foraging.  The two subspecies inhabit separate breeding grounds but overlap on their wintering grounds and during migration.  Western Palm Warblers breed roughly west of Ottawa, Ontario, while the Yellow Palm Warbler nests east of Ottawa.  

Only at the banding table do you have the opportunity to see little known features of these beautiful warblers--both subspecies have yellow foot pads!  

Above and below, you can see a good overall comparison of the appearance of the two subspecies, the Yellow Palm Warbler above, and the Western Palm Warbler below.  Photo credit:  Colin Leonard

Photo credit:  Colin Leonard

Banding was conducted by Mark Armstrong, Master Bander of hummingbirds and songbirds, and Billie Cantwell.  Banding studies give scientists information about the relative health and abundance of bird populations, as well as, alert us to changes in the environment.

Thanks to Colin Leonard and Richard Secrist for their assistance in taking photos!

View the second post in this two-part report on our Oct 11th banding session:  Migration Season

Visit my previous posts on bird banding.

Bird Banding at Seven Islands State Birding Park

Knoxville Chapter, Tennessee Ornithological Society

Visit the Knoxville Chapter of TOS on Facebook

Seven Islands State Birding Park

Seven Islands Wildlife Refuge now Seven Islands State Birding Park