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THIS WEEK at HILTON POND
22-28 April 2019

Installment #693---Visitor # free counter

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SOLVING THE MYSTERY OF AN
ELUSIVE BANDED HUMMINGBIRD

So far as Ruby-throated Hummingbirds (RTHU) are concerned, spring has sprung VERY slowly--one of the slowest starts in our 36 years of hummer research at Hilton Pond Center. As always, we hung our first complement of eight feeders on St. Patrick's Day, anticipating the first ruby-throats sometime during the last week in March. (By August we'll have deployed a couple dozen feeders to meet the needs of an ever-larger hungry hummer horde.) This mid-March feeder-hanging strategy is based on our having captured our first unbanded RTHU on 27 March in four different years, but through 28 April this year--a full month after that date--we have yet to catch or even see an unbanded RTHU.

That said, there HAVE been a few BANDED Ruby-throated Hummingbirds frequenting the Center's feeders in 2019, the first being a male recaptured on 2 April; we banded him here last August as a recent fledgling. On 17 April we recaptured our first white-throated female of the season (see photo below, and note the band); she was already an adult when we banded her locally last June. A much older female RTHU entered a trap on 26 April, having been caught as an adult in June 2016 and recaptured each year since--making her an after-4th-year individual in at least her fifth year of existence! She's an excellent example of site fidelity.

All text, maps, charts & photos © Hilton Pond Center

When people find out we study hummingbirds by capturing them and putting metal bands on their legs, a frequently heard question is whether it’s possible to see a band on a hummingbird at a feeder. The answer is a qualified "yes." We offer as evidence the photo below taken on Earth Day 2019 (22 April) of an adult male Ruby-throated Hummingbird perched on a saucer-style feeder just outside our office window at Hilton Pond Center. (We hope you can view this image on something other than a cell phone for details. Those are tiny rain droplets on his crown.) Check out that red gorget!

All text, maps, charts & photos © Hilton Pond Center

The photo also reveals a glint of metal on the bird’s left leg, a thin strip of aluminum we know from experience has a letter and five digits inscribed thereon. This minuscule ring weighs about 0.6-0.7 milligrams--less than one-thousandth of a gram--roughly equivalent to a small wristwatch or a gold signet ring on an adult human’s finger. In fact, the band may weigh less than one of the hummingbird’s tail feathers! (In the photo below, that's 300 hummer bands photoengraved on a 4" x 6" sheet!) Ornithologists believe this super-lightweight metal ring has insignificant effect on a hummer’s well-being or longevity; as evidence, we’ve had many ruby-throats return to Hilton Pond year after year after year. (One geriatric RTHU came back seven years in a row after banding!)

All text, maps, charts & photos © Hilton Pond Center

This year's male RTHU in the photo above was a wily one that made frequent feeder visits but had yet to enter one of our traps; it was almost certain he was banded in a previous year. We further suspect he was caught at Hilton Pond because the band was on his LEFT leg. We band all males on the left and all females on the right. (Most banders put bands on all their birds’ right legs for a simple reason: The right leg is easier to reach for right-handed banders, but left-handers are more likely to band everything on the left.)

Even though you can indeed see a band on the hummingbird’s left leg, chances of your reading his number or one on a hummer at your own feeder are quite slim. However, if the bird sits just right on a feeder in good light and close enough, you may be able to take a series of photos that reveal the number sequence as the band rotates around the leg in successive visits. That was our goal with this particular hummer that seemed unwilling to be re-trapped for band number verification.

All text, maps, charts & photos © Hilton Pond Center

As shown above, we set up a Canon 70D SLR camera and 100mm macro lens on a small tripod atop our office desk to see if we could photograph the band--all in hopes of reading the inscription. As part of our hummingbird research, we were intensely interested to know the band number so we could determine if and when we caught the hummer in a past year or--because near-miracles sometimes do occur--if he had been banded elsewhere by someone else before showing up at Hilton Pond.

All text, maps, charts & photos © Hilton Pond Center

After some effort on 23 April we were able to get the shot above of the bird, his band positioned so we could read the last three numerals: 268. With nearly 6,200 Ruby-throated Hummingbirds banded at Hilton Pond through the years, we’ve had several band sequences that included 268 as the last three numbers, (In more recent years we used 268-ending bands on male RTHU in 2011, 2015, and 2018.) However, because other hummer banders also could have used that sequence, we didn't jump to any conclusions. With other duties calling, we put the camera away, biding our time until another day when we might get a photo of the band in a slightly different position that revealed a letter and/or additional numerals.

On the morning of 24 April the RTHU in question started visiting a different port at the saucer-style window feeder, offering a new angle from which to photograph. After numerous exposures we finally got an image (below) that revealed his band number began with “M0.” Sure enough, last year on 5 June we banded an adult male Ruby-throated Hummingbird that received band number that began M08 and ended 268.

All text, maps, charts & photos © Hilton Pond Center

Even though we had not yet seen a first “8” on this hummer’s band, we were 99% confident the bird in question was the one from 2018—if only because we've demonstrated hundreds of times how banded RTHU return to Hilton Pond in subsequent years. That said, there was still that 1% chance this bird’s band did NOT bear the “missing numeral 8” and was first captured by someone else. For the sake of scientific accuracy, we continued trying to get a photo that confirmed this M0?268 was indeed the Ruby-throated Hummingbird we banded last year--well before it flew off to the Neotropics and came back again in 2019 for a Hilton Pond reunion.

Later in the day on the 24th we gazed out our office window and saw a hummingbird enter one of our Dawkins-style cylinder traps baited with sugar water (right). Hustling outside, we approached the trap and could see the bird hovering inside was an adult male with red gorget and forked tail. Upon carefully extracting the hummer we took a closer look and noticed a band on his LEFT leg--a good sign this was one of our returning male ruby-throats. Back inside and using a spiffy new magnifying visor necessitated by recent cataract surgery, we were able to read the band. It was none other than the elusive M0?268, and the missing numeral was indeed an "8."

Our photographic efforts to identify this hummer were productive and close to 100% accurate, but having the bird in hand to verify he was M08268 was undeniable evidence. This male, banded last year as an adult, almost certainly went off to Central America in autumn and returned half a year later to our little 11-acre compound, possibly as far as 1,500 miles from his wintering grounds. (See RTHU range map below.)

All text, maps, charts & photos © Hilton Pond Center

But how could we be positively be sure the bird we'd been photographing at the feeder was also the bird we had just caught? We have a way, and we used it--a patch of dark green temporary dye applied to the bird's upper breast.

The U.S. Bird Banding Laboratory authorizes Hilton Pond Center and Operation RubyThroat to band Ruby-throated Hummingbirds--a special permit not held by all bird banders. We also have permission to color mark RTHU, using non-toxic green dye on birds captured locally. We started this protocol to keep from recapturing the same hummingbird repeatedly in our pull-string and electronic traps. The dye is harmless and washes off or fades in about four weeks but while present allows us to see an already banded ruby-throat. The hummingbird band is essentially invisible from a distance, but by spotting the green dye we know not to set off a trap over and over and over again for the same individual--thereby lessening any unnecessary handling of our study species.

All text, maps, charts & photos © Hilton Pond Center

When we finally recaptured M08268, we weighed him (2.86g), measured him (wing 38.68mm, tail 16mm, culmen 16mm), and dabbed a little green felt tip dye on his upper breast before release. Sure enough, when we watched the window feeder a little while later, a banded and color-marked adult male Ruby-throated Hummingbird came in to drink (see photo above)--and we now knew exactly who he was.

Mystery solved!

All text, maps, charts & photos © Hilton Pond Center


All text, maps, charts & photos © Hilton Pond Center

POSTSCRIPT: We color mark with green every Ruby-throated Hummingbird we band at Hilton Pond Center, but not all these birds hang around very long--especially during migration. Therefore, it's entirely possible if you live north of York SC you could see one of "our" hummers some spring on its way northward. Likewise, if you're south of us a green-marked RTHU could appear at your feeder in fall. (The mark is easy to see on young males and females like the one above, more difficult to discern on an adult male with his dark flanks and red gorget.)

Since you may not be able to duplicate our camera set-up for photographing and reading hummingbird bands, you can still perform a valuable role by immediately reporting any color marked hummer to us at RESEARCH. Get a photo of the bird with color mark if you can! It's possible we can contact an authorized hummingbird bander near you who might recapture the bird and read its number.

There have been relatively few Ruby-throated Hummingbirds encountered away from their original banding sites. Thus, even without recapture your sighting and timely report could be very significant, so please keep your eyes peeled for color marks. (Incidentally, other hummingbird banders use different color marking protocols, including dots on the crown and back. You can also report sightings of these birds to us at Hilton Pond.)

All text, maps, charts & photos © Hilton Pond Center



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Don't forget to scroll down for Nature Notes & Photos,
plus lists of all birds banded or recaptured during the period.


"This Week at Hilton Pond" is written and photographed by Bill Hilton Jr., executive director of Hilton Pond Center for Piedmont Natural History

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The following made contributions to Hilton Pond Center during the current period:

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BIRDS BANDED THIS WEEK at
HILTON POND CENTER
22-28 April 2019

SPECIES BANDED THIS PERIOD:
American Goldfinch--11
Chipping Sparrow--3
Carolina Chickadee--4 (3 chicks)
Yellow-rumped Warbler--1
* House Wren--1
Indigo Bunting--1
Ovenbird--1
*
Northern Cardinal--5
House Finch--3
Eastern Bluebird--1
*
Brown-headed Cowbird--1
Red-bellied Woodpecker--2
Blue Jay--1
Mourning Dove--2

* = new banded species for 2019


PERIOD BANDING TOTAL:
14 species
37 individuals


2019 BANDING TOTAL:
33 species (38-yr. avg. = 64.1)

851 individuals
(38-yr. avg. =
1,815.2)


38-YEAR BANDING GRAND TOTAL:
(Banding began 28 June 1982; since then 171 species have been observed on or over the property.)
127 species banded
68,981 individuals banded

Ruby-throated Hummingbirds = 6,193


NOTABLE RECAPTURES THIS WEEK:
(with original banding date, sex, and current age):
Ruby-throated Hummingbird (2)

06/10/16--after 5th year female
06/05/18--after 2nd year male

Chipping Sparrow (1)
04/03/17--after 3rd year male

Carolina Chickadee (4)
06/03/14--6th year male
06/07/16--4th year female

10/02/18--2nd year female
10/14/18--2nd year female

American Goldfinch (1)
08/30/17--after 3rd year female

Northern Cardinal (1)
09/26/18--after 2nd year female

White-breasted Nuthatch (1)
10/16/18--after 2nd year male

House Finch (1)
10/21/18--after 2nd year male

Tufted Titmouse (3)
05/24/16--4th year male
12/05/17--3rd year female
07/27/18--2nd year male

Carolina Wren (1)
01/18/18--after 2nd year female

White-throated Sparrow (1)
03/30/17--4th year unknown

Downy Woodpecker (1)
04/24/15--after 5th year male


OTHER NATURE NOTES:
--Still no unbanded Ruby-throated Hummingbirds at Hilton Pond Center through 28 Apr, a very slow start compared to most of the 36 years in our study. This week's sparse RTHU returns from previous years are listed below left; most significant is a female banded in 2016. (We have just four hummer returns so far in 2019--far below average.)

--Among other returns of particular interest this week was a 6th year male Carolina Chickadee who's apparently been helping raise chicks at the Center for the past five years--as evidenced by his cloacal protuberance at recapture every spring since banding. (We first caught him as a recent fledgling in 2014.) The same is probably true of an after 5th year Downy Woodpecker male that has sported a brood patch every spring beginning in 2015. (Among most woodpeckers, the two genders share nesting duties; both develop a naked patch of belly skin that enhances heat transfer during incubation.)

-As of 28 Apr, the Center's 2019 Yard List stood at 59--about 34.5% of 171 avian species encountered locally since 1982. (Incidentally, all 59 species so far this year have been observed from the windows of our old farmhouse! If you're not keeping a Yard List for your own property we encourage you to do so, and to report your sightings via eBird. You, too, can be a "citizen scientist.") New species observed during the period: Ovenbird

--Our immediate past installment of "This Week at Hilton Pond" was about woodland wildflowers and a trio of birds and is always available on the Center's Web site as Installment #692.

All text & photos © Hilton Pond Center



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sightings of
Color-marked
Ruby-throated Hummingbirds


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Hilton Pond Center for Piedmont Natural History is a non-profit research, conservation & education organization in York, South Carolina USA; phone (803) 684-5852. Directed by Dr. Bill Hilton Jr., aka "The Piedmont Naturalist," it is parent organization for Operation RubyThroat. Web site contents--including text and photos--may NOT be duplicated, modified, or used in any way except with express written permission of Hilton Pond Center. All rights reserved worldwide. To request permission for use or for further assistance, please contact Webmaster.