Juvenile Hummingbird Behavior

Young hummingbirds leave the nest full of curiousity and uncertainty. 

They have to figure things out quickly and innocence is short-lived, but their initial hesitation and confusion is easy to spot in the garden.  The hummingbird population in my yard in east Tennessee more than doubled in mid July when the first broods of nestlings left the nest.  A male Ruby-throated hummer dominated the five feeders on the garden side of the house, but he tolerated other hummingbirds in the garden. 

This made juvenile-watching opportunities!  How do you know you are watching a young hummingbird?  Behavior.  Before they become aggressive bombardiers, chasing each other with bad tempers, their behavior is tentative.

Still strengthening their wing muscles, they sometimes perch on stems to find nectar and insects or just to pause and look around.

Which part of this flower has the nectar anyway?

Hummingbird and Coneflowers.  Original watercolor by Vickie Henderson.

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

Hummingbirds and Jewelweed

Recognize this watercolor?  It's the hummingbird painting you see in my blog banner!  

Maine's Wild Seed project contacted me earlier in the year to inquire about using one of my hummingbird paintings with their article on Jewelweed's beneficial relationship with hummingbirds. Life gets busy and after we made arrangements, I actually forgot about it! What a delight to see this beautiful spread of my "Hummer and Jewelweed" painting in the latest publication of Wild Seed, Returning Native Plants to the Maine Landscape. 

Maine's Wild Seed project educates people about the important relationships between native plants and animals and how these relationships support each other.  Their magazine is beautiful, a feast for the eyes and informative to read.  They also have tons of helpful information and resources available on their website:  http://wildseedproject.net/  Pay them a visit and plant native plants!

Maine's Wildseed Project
Hummer and Jewelweed prints on my website, Vickie Henderson Art

Hummingbird Days!

Some days are hummingbird days!  These are days when activity at the nectar feeders so captivates our attention that we don't want to miss anything.  Watching is irresistible. Nothing else gets done!

Ruby-throat approaching Royal Catchfly            Photo by Vickie Henderson

Today was one of those days for me!  Yesterday, I brought home a new native plant species hummingbirds love--Royal Catchfly (Silene regia).  A native prairie plant, it gets its name from glands that secrete a sticky enzyme that attracts and captures insects. Though the plant is related to carnivorous plants, it does not benefit nutritionally from the insects.

Hummer and Royal Catchfly                

The new flower species was only one change that attracted my attention and the hummers.  I added a new feeder.  The two males guarding the four feeders I had out were chasing all the juveniles away. No sooner would an approaching juvenile escape one male, than it would be intercepted by the second. Not nice--but typical hummingbird behavior.    

A juvenile male waiting to approach a feeder.

I added the new feeder around the corner near a small garden.  Wthin minutes of hanging it, Wow! Juveniles! Sometimes two or three arriving at the same time, reacting to each other with tails flared, face-offs and chirps. Very shortly, however, another male showed up.  A beautiful male, breath-taking to see at such close range. I was sitting only a few feet from the feeder.

The male, pictured above, was showing some molting, replacing old feathers with new ones, his feathers getting ready for fall migration.

The tenacity of one of the juveniles was surprising  He did not want to give up his feeder and challenged the male repeatedly.  In the image below, the male is watching the juvenile and balancing to face him as he hovers and threatens.

When the juvenile landed on the feeder after the male departed, the male was quickly on him displaying shuttle dives, short repetitive U-shaped dives, coming very close to the juvenile at its lowest point.  I have seen this display during courtship but never before witnessed it during aggression at the feeder.  Serious stuff. So far, warnings, but getting close to the real thing.

To my relief, the juvenile retreated to the garden and perched on the plant stake supporting the catchfly. For a while, he sat very still, looking like one of the leaves, blending in with the foliage. The male went about his business and the confrontation ended.

Male juvenile, above, hiding in the catchfly, showing developing red gorget feathers as he looks up. Every day of their fast-paced lives holds a survival story!

Juvenile Ruby-throat with Coneflowers     Watercolor by Vickie Henderson

This is the height of hummingbird season, the best time to see and enjoy them. The first juveniles are out of the nest, second nesting has begun, and northern hummingbirds have already begun migration.

For an extra treat this season, join us at the Wonder of Hummingbirds Festival at Ijams Nature Center, in Knoxville, TN, on August 20th to celebrate these magnificent birds!  More information is found in the link below.

Links and resources:

Photo credits:  All the photos in this blog post were taken by Vickie Henderson

Ijams Nature Center website with festival information
Wonder of Hummingbird Festival 

Links for hummingbirds in art:
Hummingbird art at Vickie Henderson Art
Hummingbird posts at Vickie's Sketchhbook
Sketching hummingbirds in flight
Hummingbird Studies in watercolor

Ruby-throat Combat is Serious Business

These are the final days of Ruby-throat migration.  The last of the juveniles and late female breeders will be gone from my area in east Tennessee in a little over a week, as they move southward and eventually arrive in their wintering areas in southern Mexico and Central America.

We often attribute Ruby-throated aggression to high testosterone levels during breeding season, but clearly some of that aggression is pure Ruby-throat personality. In fact, this young bird makes it appear they are born with this aggression and have a timing-mechanism that stimulates its expression by the time they migrate.

On most mornings recently, the hummers drink hurriedly and move on to feed on insects, paying little attention to each other, sometimes even settling on the same feeder to drink.  This morning was different, however, with two juveniles keeping up a relentless dispute over territory that lasted at least fifteen minutes, if not longer.  

Their combat included face to face flight moving high into the air and dropping low into foliage.  Once I saw them land on twigs in close proximity, each seeming to expect the other to leave before they finally tangled in defiance.  Sometimes they directed high speed dives at each other and many times I heard wing buzzing and in-flight "splats" like those you hear at the feeders, but neither would give up dominance.

Eventually, they ended up on the ground. Having seen this before, I expected a brief skirmish with both birds eager to return to the air.  What I saw surprised me.

One bird succeeded in pinning the other to the ground and seemed quite content to keep him there. His posture as he held the bird down gave every indication of victory, with wings spread, neck stretched, looking slowly from side-to-side, as if proud, giving the appearance of dominance posturing.  You can see the top bird's foot in the above image and some of the others. He appears to have the bird pinned by the shoulder and right wing.  It is also likely that his other foot is on the bird's beak since the pinned bird did not raise his head while on the ground.

While holding the downed bird firmly in place, the top hummer proceeded to alternately lift his feet up and down in a "kneading" pattern, his body rocking with the movement. The pace would be similar to the steady rhythm of kneading dough.  A hummer's version of stomping?  This movement and pin-down lasted approximately a full minute and I became concerned that the downed bird might not survive.

As you scroll through the images below, you will see that the bird on the bottom is trying to move, curving his back to struggle free and moving his left wing.

I can't be sure if the top bird was ready to leave and simply lifted off, or if the bird on the bottom wiggled free.  Since I couldn't see the bottom bird clearly while watching, after the top bird flew, I walked over to look at the ground and fully expected to see a dead hummingbird.  Much to my relief, he had flown too.

It is pretty amazing how quickly a hummingbird's life changes from timid fledgling to sword-carrying militant. Clearly this young male is wired for survival!

More about hummingbird aggression 
Bob Sargent on Ruby-throated Hummingbirds
Hummingbird Study Group
Other posts on Hummingbird migration

Albino Ruby-throated Hummingbird in Tennessee

A snow white beauty with pink bill, pink skin and red eyes, this albino ruby-throated hummingbird is visiting the home of friends, Cyndi and Steve Routledge, in middle Tennessee. (I'm ready to jump in the car and drive the four hours to visit them!)

One can't be entirely certain of the species because rufous hummingbirds from the west have already appeared in Tennessee, but since albino pigmented hummingbirds are short lived, this is more than likely a juvenile ruby-throated hummingbird.

According to Mark Armstrong, our Master Bander of hummingbirds here in Knoxville, Tennessee, Bob Sargent has banded about 50 albino hummingbirds over his career as a bander, but none have ever returned in subsequent years.

Albinism is a genetic mutation that prevents the production of melanin in the body, which is required for pigmentation or color.  Albinistic birds have pink or red eyes because of this lack of pigmentation--the eyes are reflecting the red color of the blood vessels.  Albinistic birds seldom live long because they are more visible to predators. Their odd appearance makes it more difficult for them to attract a mate so the genetic mutation for albinism is seldom passed to the next generation, making the occurrence of albinism very rare.

Cyndi describes their surprise discovery of the bird. "Steve first spotted the white bird on late Thursday afternoon (9/19). It was high in the canopy in our side yard in the afternoon sun searching for insects. At first he thought it was a big white moth, but soon realized what it truly was. He called to me (I was making dinner) and I was able to get a quick glimpse of it as it flew up and over the tree into the neighbor's yard."

Steve and Cyndi set up watch at the front and back feeders of their house and soon their snow white visitor reappeared.  

Above, albino ruby-throated hummingbird scratching. All photo credits in this post: Cyndi Routledge

The albino bird has been at the Routledges for four days.  Cyndi says, "He/she likes to perch in our Snowball Hydrangea bush.  Because it's white we have no way of knowing male or female unless it's "in hand".   I sent the pictures to Bob Sargent Thursday night since we were not sure whether it was a true albino or leucistic. Bob believes it's a true albino because it has pink legs, a pink bill, a red eye and pink skin."

Cyndi describes the bird as very vocal, "chattering away" when another ruby-throat comes into view.   "He likes to sit in the sunshine and preen, and I had a wonderful time watching him as it began to rain on Friday afternoon.  It was like he was taking a shower--fluffing and shaking and getting a quick drink from the raindrops on the leaves of the hydrangea."

"Alby, as Steve calls it, is very territorial of the hummingbird feeder that hangs right at the base of the hydrangea bush.  He chases off all other ruby-throats and this morning was chasing off Tufted Titmice who at first were actually chasing him/her.  My best guess was they, like ourselves, thought it was a large moth!"

"He also very much likes the salvia guaranitica (a gift from Bob and Martha Sargent this past spring) that is planted along our front sidewalk." (pictured above)

"This tiny little white bird is truly an amazing sight…it's a tiny little white angel."
Cyndi Routledge

All photo credits in this blog post:  Cyndi Routledge, photographer and naturalist in Clarksville, TN.

Ruby-throated Hummingbirds
Hummingbird Study Group
Cornell on Albinism and Leucism
Banding hummingbirds
Hummingbird migration

A Hummer Encounters a Praying Mantis

This male ruby-throated hummingbird's behavior alerted me that something was happening beyond the usual hummingbirds advancing on his feeders.  He was turning his head from side to side far more frequently than typical for a hummer guard behavior.    

I continued to watch until he revealed the subject of his divided attention. In the image below, you can see a praying mantis on the dark leaf in the holly, just above and behind the hummer's head.  Praying mantis prey on hummingbirds.  I briefly considered moving it out of the holly, but decided I shouldn't interfere and, instead, watched to see what would happen. Needless to say, these weren't the most relaxing observations of hummer behavior I've experienced!   

The male-ruby throat ignored the praying mantis most of the time, but ever so often, the insect would get his attention--possibly with a movement--and the hummer would investigate.  This was a little un-nerving.  I've never seen a praying mantis strike its prey and I wasn't interested in seeing that happen.  On the other hand, I was glad to see that the hummer was aware and keeping track of the insect's behavior.

Below, the hummer leaves his perch and hovers near the mantis to get a closer look.

Soon after this interaction. while the hummer was away from his perch, the mantis traveled down the leaves to a limb below the hummers perching twig.     

The color of the praying mantis blended so completely into the hues of the holly, that even when I knew where he was, the insect was hard to find.  In the image below, he is located on the limb below the hummer's perch, hanging upside down, about in line with the hummer's beak.

The hummer continued to guard his feeders, but to my relief, he appeared very aware of the praying mantis. He discovered the mantis in his new location and investigated.  

Not yet bothered enough to give up his perferred limb, the hummer continued protecting his nectar source. Below, you see him perched on the holly twig with the praying mantis lurking underneath the limb below him.

The hummer dropped down to check him out several times.   Each time, I held my breath!

 Back to the perch again.

A closer look at the praying mantis as he hangs from the holly limb. Notice the sharp appendages on his legs.

Below, you see the hummer on his twig, and the mantis still below, but the insect has moved again. This time, he has crawled up even with the limb, holding on to leaves with his hind legs while keeping his front legs free. Each time the hummer lands on the twig it bends closer to the praying mantis, especially when perched on the lower end.

A closer view of the mantis' new position in the image below. It became clear to me at this point, if I had had any doubt before, that the mantis was stalking the hummingbird.  With each new position, the insect moved closer to the hummingbird.  I don't mind saying, watching this progression gave me the creeps!

The hummer returned to his twig perch briefly, but this time seemed disturbed by the mantis' new position. After several brief touch-downs followed by hovering, to my relief, he moved to a new perch!

Another reason to be totally amazed by the life and behavior of ruby-throated hummingbirds!

Links and resources:
For a quick look at how a preying mantis strikes its prey:  Perfect Predator
Hummingbirds and pollination
Hummingbird Banding
More posts on Ruby-throated Hummingbirds on this blog
Hummingbird art at Vickie's Sketchbook