bald cardinals

Wood Thrush Notes

End of Summer-Early Fall Notes

We have received more than a few calls recently regarding the very noticeable slowdown at feeders in recent weeks. The degree of slowdown may vary each year but without a doubt September and October are the two slowest bird feeding months of the year. My 28 years of tracking sales data backs this statement up. We always sell far less seed and suet during these two months. So why does it slow down?

There are two reasons why feeder activity slows down at this time. Feeder activity is at peak level during the breeding-nesting season, between the months of March and July. We get used to the abundance of birds visiting our feeders and many of us are filling feeders frequently, every other day if not more. While nesting and raising young birds take full advantage, but do not rely on our feeders. Raising young takes a tremendous amount of energy and rather than having to forage for food at greater distances they will increase their visits to feeders exponentially, thereby staying closer to the nest and their valuable offspring. And many of our feeder birds will nest twice per breeding season. So, the first reason for the slowdown is the breeding season for our year round and summer resident birds has long been over, for at least a month and a half. The need for “extra” food has passed.

The second reason is by the end of summer and beginning of fall plants are producing seeds, nuts, and fruit. Beneficial insects chocked with protein are still very much available. Instinctually, birds cannot pass up the abundance of natural foods and variety now available. Therefore, the feeders that were important to them in the spring and summer become less important now. With no young to attend to they have little to do but feed on what nature is offering and to cache food for later use. Sure, you will still get birds visiting your feeders but not like during the breeding season. This would also explain why we rarely see Rose-breasted Grosbeaks at our feeders in the fall on their return trip to the tropics, when they are such prominent feeder birds in spring. Natural food is everywhere and unless something occurs to prevent food production, like a drought, birds will gravitate to it before going to feeders.

As much as the business owner side of me hates to see the slowdown I also appreciate the opportunity to point out birds do not rely on or survive on our feeders, as many people mistakenly believe.

Experience says by mid-November, or earlier if there are a couple of good frosts, you will see a return to busy feeders. So, don’t think something has happened to our birds. It really is just birds being wild animals acting on thousands of years of instinct. They will return to your feeders. By the way, this slowdown is a great opportunity to give your feeders a thorough cleaning.

Molting

Have you been finding feathers around your yard, or maybe seen some really funky looking Cardinals or Bluejays recently? Seeing Cardinals or Jays with an alarming lack of feathers on their heads is quite common after the breeding season.

Molting is the process by which birds lose damaged or worn out feathers with new ones providing them not only with healthy new feathers but often a new look to their plumage in the form of new colors or patterns that may indicate a bird’s age, sex, or season of the year.  Feathers are comparable to our hair or nails made from the same basic ingredient, keratin.  

Molt is not a “one size fits all” occurrence.  There is great variation by species and even by individual from year to year.  While molt is associated with this time of year any time a bird loses a feather a new one will immediately begin to grow in its place. 

Occasionally, Cardinals and Bluejays will lose all their head feathers in a short amount of time and while it takes a while for the new ones to grow in the result will be a bald bird.  I’ve seen a number of male Cardinals recently that were in between bald and the emergence of new feathers.  They look rather odd as their heads under the feathers are dark gray to black.

Molting Cardinal

Hummingbirds Getting Plump

I’ve seen some chubby hummers at the feeders lately as they continue to feed heavily and store fat for their long journey.  There’s plenty of time remaining to enjoy hummingbirds as they prepare for their return to Central and South America.  While you may have already seen a reduction in numbers of hummers at your feeders keep in mind Ruby-throated hummingbirds continue to head south from as far as Canada.  These very birds may show up at your feeders at some point weeks from now so keep the fresh nectar coming and your feeders clean.  Earlier in September I was in Maine and had several sightings of hummingbirds.  Isn’t it amazing when you consider the distance traveled by these little dynamos?

Wood Thrush Notes

Update on Mysterious Bird Deaths

Last week we reported on the mysterious bird deaths taking place north of us and in Mid-Atlantic states. We have had no reported sightings of sick or dying birds from customers here in Nashville but we do recommend being vigilant. The TWRA has collected some specimens for testing and will make a statement next week regarding their findings. At this time the TWRA is recommending that feeders be taken down if you witness a dead or obviously sick bird. As reported last week the species most affected thus far have been Robins, Blue Jays, Common Grackle, and Starlings. I wish we could offer more detailed and definitive information; however, there is still much to be learned. As information from credible sources is gathered we will promptly share it with our customers.

Bald Cardinals

I have seen a number of Northern Cardinals recently that are partially to totally bald. They do look odd but it is normal and temporary. After the breeding season and usually beginning in mid-summer birds begin molting. Northern Cardinals and Blue jays often lose all of their head feathers at once rather than a little at a time like most other songbirds making their molt mostly unnoticeable. Sometimes the feather loss can be the result of a feather mite but this particular molt pattern for Cardinals and Jays is considered normal. If you see what appears to be a Cardinal with a black head grab some binoculars and look a little closer. It’s slightly disturbing at first but it does offer an interesting glimpse at the position of the ear which is below and back of the eye.

Miscellaneous Bird News

Once in a while as I am considering subjects to write about for our blog I run out of inspiration.  So, this week I’ve decided to try something different and touch on a number of “odds and ends”.  A mixed bag if you will of current bird issues to ornithological vocabulary. 

Finches with Eye Disease

We’ve been seeing some evidence of House Finches with an eye disease known as Mycoplasmal conjunctivitis, or House Finch eye disease.  And just yesterday a customer inquired about a bird that seemed sick.  It did not move away as she approached, as if it was not really aware of her presence.  The bird turned out to be a sick House Finch.  We had one behind the store the other day that was afflicted with the disease.  We hear reports and see evidence of this every year that range from sparse to wide-spread.  
Birds infected with House Finch eye disease have red, swollen, runny, or crusty eyes. In extreme cases the eyes become swollen shut and the bird becomes blind. House Finch eye disease is caused by the bacterium Mycoplasma gallisepticum. This bacterium has long been known as a pathogen of domestic turkeys and chickens, but it has been observed in House Finches since 1994. The disease has affected several other species, including American Goldfinch, Evening Grosbeak, and Purple Finch
You might observe an infected bird sitting quietly in your yard, clumsily scratching an eye against its foot or a perch. While some infected birds recover, many die from starvation, exposure, or predation. If you’re a songbird it’s impossible to survive if you can’t see.
When birds are concentrated in a small area like at a birdfeeder the risk of a disease spreading within that population increases.

What To Do
If you detect a sick finch at your feeders the standard procedure is to take down your feeders for a few days to a week and give them a very thorough cleaning.  Cleaning your feeders is always a good idea and is recommended it be done on a regular basis.  Clorox wipes are very handy to give your feeder a quick clean particularly around the feeding ports.

Altricial vs Precocial

Almost all of us have seen baby songbirds in a nest.  We know they are completely dependent on the adults to keep them warm as they are featherless for the first few days and to bring them food while in the nest developing.  They are completely helpless and mostly immobile.  And the adults continue to feed them for weeks even after they have fledged. This is referred to as altricial.  Altricial birds include herons, hawks, owls, and most songbirds.
Precocial means young are capable of a high degree of independent activity immediately after hatching. Precocial young typically can move about, have their eyes open and will be covered in down at hatching. They are generally able to walk away from the nest as soon as they have dried off.  They will also begin searching for their own food. Examples of precocial birds include most duck species, Wild Turkey, Quail, Killdeer and Canada geese.

Have you seen them?  I’ve seen several in the past few weeks.  I’m referring to bald cardinals.

In mid to late summer it’s not uncommon to see Northern Cardinals, and sometimes, Blue jays, completely void of head feathers.  This odd appearance can sometimes be attributed to the summer molt, or more likely from feather mites. 
Most bald-headed-bird reports occur in summer and fall, which are typical molting times. According to the Cornell Lab of Ornithology many of these strange-looking birds may be juveniles undergoing their first pre-basic molt, which produces the first winter adult plumage. For some unknown reason, the bald birds may have dropped all of their head feathers at once. Staggered feather loss and replacement is the normal pattern.
It is possible that the baldness is caused by feather mites, or lice. A mite infection is the likely explanation for the loss of head feathers only.  After all, the head is the one place a bird would not be able to preen effectively to control mites.    Feather mites are tiny arthropods, whose feeding destroys feather shafts.  This is not a condition the affected bird will not recover from.
But why does it seem to affect primarily Cardinals and Blue jays?  Do other songbirds have effective methods of removing these parasites from their heads?  We’re just not sure.

Interesting Behaviors of Birds

Wood Thrush Shop employee, Eli Haislip, recently photographed an adult Red-bellied woodpecker feeding a juvenile Northern Flicker.  Over the course of a few days he witnessed the Flicker following the Red-bellied woodpecker and begging for food.  So, is this an example of hybridization, where two different but compatible species mate, or an example of a Flicker laying an egg in the Red-bellied’s nest?  I looked for information regarding hybridization among songbirds and there are examples ranging from rare to common.  Some examples of common hybridization include Baltimore and Bullock’s Oriole and Indigo Bunting and Lazuli Bunting.  Examples of rare hybridization include Blue jay and Stellar’s jay and Eastern Bluebird and Mountain Bluebird. This juvenile seems to possess all the field marks of a Northern Flicker and none of the Red-bellied woodpecker but we may just have to settle for uncertainty.

Adaptable Bluebirds

I’ve always tried to point out to people that Eastern Bluebirds are not nearly as choosy about nest-sites as they have been portrayed.  If Bluebirds really needed such specifics in the location of a nest-site they probably would have been extinct by now.  And there’s nothing natural about a birdhouse but they, as well as other species, have adapted to using them because they “represent” something they would find in nature.  I have seen Bluebird nests in large horizontal pipes, a hole in a basketball goal pole, and even in a stack of cement foundation blocks.  But a new one was presented to me by a customer recently.  A pair of Bluebirds used the abandoned nest of a Robin, Phoebe, or Barn Swallow.  It was hard to see detail in the picture but the nest was built of mud and plant material on a ledge against the wall of the house under an eve.  The Bluebirds raised an undetermined number of young in this nest.