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A Column Promoting a More Earth-Friendly Lifestyle

By John L. Turner

John Turner

During their lives trees perform functions critical to the health of forests and its wildlife — providing oxygen to the atmosphere for the benefit of all animals including humans, preventing soil erosion and helping to enrich and aerate the soil, and producing food such as nuts, fruits, and seeds that nourish many species of wildlife. 

In death, trees continue to serve vital ecological functions; as the wood softens and the bark peels away from the trunk, the tree creates nesting and roosting habitat as bats and many insects and other invertebrates seek shelter under the bark as does one bird, the brown creeper, which builds it’s crescent shaped nest under large pieces of bark. Woodpeckers have an easier time excavating cavities in the trunk creating nesting habitat for themselves and more than 80 other species of North American birds. These cavities are used by many other wildlife including reptiles, amphibians, and, of course, many mammals like raccoons and flying squirrels. Condominiums in the tree canopy are available to many! 

As the wood softens further, breaking down from the elements of weather, fungus, bacteria and insects, the standing tree becomes a cafeteria too. Woodpeckers chip away the softened wood to feast on beetle grubs previously hidden beneath the surface and mammals feed on several types of shelf fungus that sprout from the trunk like the well known chicken-of-the-woods and hen-of-the-woods, two delicious mushrooms that humans like too!

Given all the benefits of dead trees, which collectively help to stabilize local ecosystems, the message is obvious — if you have dead trees on your property located out of harm’s way from structures such as your home, garden sheds, and the like, let the dead tree give life. If you do, you might be lucky enough to see a roosting screech owl or a flying squirrel gliding from one tree to another in the darkness

A resident of Setauket, author John L. Turner is a naturalist, conservation co-chair of the Four Harbors Audubon Society, and Conservation Policy Advocate for the Seatuck Environmental Association.

 

Red-bellied Woodpecker. Pixabay photo

By John L. Turner

Part Two

John Turner

Of the twenty-two species found in North America (twenty-three if you’re optimistic the Ivory-billed Woodpecker still exists and who doesn’t hope that?) we have seven woodpecker species  inhabiting Long Island’s forests. 

The Pileated is the largest, being about the same size as the American Crow. It is the “Woody Woodpecker” of woodpeckers! They have begun to repopulate Long Island after a long absence, benefitting from the maturing forests of large trees in protected parks and preserves.  

I saw my first Long Island Pileated earlier this year in the Humes Preserve in northern Nassau County, when a male broke out from the tree line and flew across a long  meadow before reaching the woods on the other side, providing a five second view of this unmistakable species. Running to the point where it had re-entered the forest I enjoyed closer views of the bird banging away on the bark of a tree, interspersed with the bird’s raucous call. If you hear them on a hike, look around on tree trunks for their distinctive, rectangular-shaped excavation holes they make in search of beetle grubs, their favorite prey.   

Downy woodpecker. Pixabay photo

In contrast, the Downy Woodpecker is the smallest of the Island’s  woodpeckers and is also quite common, with almost every forest and suburban woodlot hosting a pair of Downies, where they often reveal their presence by their downward slurring “whinny” call. Recently, in a property on the west side of the Nissequogue River, I watched a pair of Downies fly into a nearby black walnut tree and perform a courtship dance. The two forms moved in jerky robotic motions responding to each other — a crazy motion following short bouts of stillness broken once again by motion. This went on for thirty seconds or so before they flew off, leaving a smile on my face.   

The Downy Woodpecker’s slightly larger cousin — the Hairy Woodpecker — is also common and widespread in New York. The Hairy prefers deeper, more intact forests than does the Downy. These two species are easily confused. One clue to distinguish them is found in the white outer tail feathers of the two species. A long time ago, as a youthful birder, I learned this clue: the Downy Woodpecker has black spots on its feather while the Hairy lacks them, which I put to memory using a mnemonic device “The Downy has dots while the Hairy hasn’t”; the Hairy’s bill is also proportionally larger.  

The most beautiful woodpecker that calls Long Island home is undoubtedly the Red-headed Woodpecker. No other woodpecker, or bird in North America for that matter, has the Red-headed’s striking color combination of a brilliant red head and black and white wings and body. Unfortunately, breeding bird data indicates this species is in fairly rapid decline in the state although the cause(s) has not been fully identified. 

Red-headed Woodpecker. Pixabay photo

One reported cause is being hit by cars due to its habit of hawking for insects flying over roads. They are a rare breeder here.  Several years ago a breeding pair nested in Manorville but seems to have vacated the area and there is currently breeding activity in the Flanders of the Pine Barrens.

It’s relative, the Red-bellied Woodpecker,  shows a reverse trend in the state, as this woodpecker, once of a more southerly distribution, has rapidly increased in abundance. In fact, in Ludlow Griscom’s 1923 Birds of the New York City Region, the Red-bellied is reported as being a very rare bird having been seen merely three times in the area, the last being in 1895. However, by the 1960’s the species was well established and has continued to expand its range northward, being a confirmed breeder in slightly more than one-third of the census blocks in the 2005 NYS Breeding Bird Atlas. The bird is now a common breeder here and its breeding range has extended as far north as mid-New England. They are found in virtually every wooded park on Long Island. 

The Northern Flicker, the males being distinguished from females by the black mustache mark they possess, is the most widespread woodpecker in New York. A lover of ants, the Flicker spends more time on the ground to feed on them than any other woodpecker. This predilection for ants, which are unavailable in the winter, is the main reason why flickers are among the most highly migratory of all woodpeckers.

I remember hiking several decades ago through a park in the Long Island Pine Barrens where a wildfire had burned off the forest floor and understory, exposing countless large ant mounds. For the next several weeks I saw Flickers commonly here, taking advantage of countless ants exposed by the fire. 

This leaves, for last, the Yellow-bellied Sapsucker, a bird that, as the name suggests, has a diet different than it’s brethren. Sapsuckers routinely drill small holes, typically parallel rows, in thin barked trees and routinely return to lap up the sap and any small insects attracted to it with their aforementioned brush-like tongues. This species doesn’t breed here, raising its young further north, but both adults and immatures can be seen on Long Island, especially during fall migration.  

There are two other woodpecker species found in New York State but not on Long Island — the Black-backed and Three-toed Woodpeckers. These are Adirondack specialties where they inhabit dense spruce forests. Both species share the basic black-and-white pattern of most other woodpeckers but instead of having red crowns possess yellow ones. They are also distinctive by the three toed feet they have rather than four. They are most abundant in forests where fire has killed swaths of  trees, setting the stage for the many beetles that feast on the dead wood. While disturbance like wildfires typically can adversely affect wildlife,  woodpeckers are a group of birds that can benefit from perturbations in the environment.   

Whether it’s their unique behavior, impressive anatomical adaptations, or ecological importance due to their cavity making abilities, the native woodpecker species of Long Island are an interesting and important part of nature’s fabric here.  Why not spend some time getting to know the species which inhabit yards, parks and woodlands in your neighborhood?

Part I of Wonderful Woodpeckers appeared in the issue of October 24. Read it here.

A resident of Setauket, author John L. Turner is a naturalist, conservation co-chair of the Four Harbors Audubon Society, and Conservation Policy Advocate for the Seatuck Environmental Association.

From left, a female and male Pileated Woodpecker. The male can be differentiated from the female by its red cheek stripe and longer red crown that extends to its bill. Pixabay photo

By John L. Turner

Part One 

John Turner

Perhaps you remember, from those good ol’ days in high school biology, the phrase the teacher requested that you memorize: “Form begets function.” This truism reflects a universal fact that a strong correlation exists between the form of an animal or body part and the function it performs.

The long legs of a heron, for example, help it excel at wading in the shallow water of pond edges where it employs its long, dagger-like bill to spear fish and frogs. Similarly, the shape of a barnacle, growing on rocks in the intertidal portion of the ocean where crashing waves can dislodge anchored objects, is shaped to deflect wave energy. 

Nowhere is this “form fits function” rule better exhibited than with our native woodpeckers, birds that grip the vertical surface of bark while hammering away on wood. Indeed, from head to tail woodpeckers are the epitome of the truism. Many of their physical features allow them to excel when pecking on wood.  

Let’s start with the tail. Woodpecker tail feathers, especially the middle two, are quite stiff, much stiffer than, say, a blue jay feather. This rigidity is a major benefit as the tail serves as a brace, similar to a telephone lineman’s legs against the utility pole, helping to anchor the bird against the side of a tree. The other part of the anchor involves very strong feet equipped with sharp and powerful claws enabling the bird to maintain a firm grip, a grip enhanced because a woodpecker’s four toes are aligned with two toes in the front and two in the back to better grip bark, compared to a songbird’s foot with three toes in the front and one in the back. 

A male Pileated Woodpecker. Pixabay photo

These anchor points serve well as the woodpecker uses them to actively probe crevices in the bark, as well as to hammer away wood in search of grubs lurking beneath. And this is where the adaptations in the bird’s skull come into play. According to the definitive text on this bird group “Woodpeckers of North America,” a Pileated Woodpecker may strike with its bill, and by extension its skull, 12,000 times a day. Even more remarkably, the deceleration force each time can be as much as 1,200g. This is equivalent to a human hitting their head against a wall while running at 16 mph — each and every strike.    

How does a woodpecker avoid damage to its brain and eyes from the constant hammering? To protect the brain, the skull has developed two thick spongy sections, one in front of the brain and the other behind it, which help to absorb the shock.  In woodpecker species that spend a great deal of time hammering rather than pecking and flicking, this frontal section is larger. A woodpecker’s behavior can also reduce the impact of the blows by slightly changing the angle of each strike  thereby preventing an impact to the same part of the brain with each blow.

A woodpecker’s eyes are also vulnerable to damage and, not surprisingly, here too they’ve evolved several adaptations to minimize damage. With the bird’s head moving at such speed and then coming to an immediate stop their eyes could be damaged and possibly pop out of their sockets. To prevent this, a nictitating membrane, sometimes referred to as a bird’s “third eyelid,” closes an instant before impact keeping eyes securely in their socket and preventing any wood chips from damaging the eyes. Similarly, a tuft of short feathers situated at the base of the upper bill serves to prevent chips from flying into the eyes.

The adaptations don’t stop here, as woodpecker’s tongues might be the most fascinating example of “form begeting function” in this unique group of birds.  The shape of woodpecker tongues is quite diverse. 

A male Northern Flicker identified by his black whisker. Pixabay photo

Sapsucker tongues, which as their name suggest, lick sap from holes (known as sap wells) they’ve created in tree bark, are brush-like to help lap up the liquid. In contrast, woodpeckers that search for beetle grubs in rotted wood have tongues that are stiff and barbed, with some possessing backward pointing spines like a fish hook to assist in extracting prey. Sticky saliva also helps in capturing prey. 

If you stick out your tongue you can feel it is anchored to the bottom of your mouth, toward the back. Not so with woodpeckers. Remarkably, their tongues are not anchored in their mouths at all; they are anchored in their forehead near the base of the upper bill and wraps entirely around their skull. This makes the tongue quite extendable and in Northern Flickers means they can stick their tongues out a full two inches beyond the tip of the bill, a good skill to have for nabbing ants from a distance.   

Virtually all woodpeckers are cavity nesters with most taking the time to excavate the nesting and roosting cavities they use. In this way, woodpeckers play a crucial role in providing nesting opportunities for other cavity nesting birds such as Screech Owls, Eastern Bluebirds, Black-capped Chickadees, Tufted Titmice,  and Great-crested Flycatchers. In total, woodpecker cavities are used by more than 40 bird species in North America for nesting and roosting and provide shelter to several mammals such as flying squirrels and even some snake and lizard species.  

Read Part II of Wonderful Woodpeckers in the issue of November 21 or click here.

A resident of Setauket, author John L. Turner is a naturalist, conservation co-chair of the Four Harbors Audubon Society, and Conservation Policy Advocate for the Seatuck Environmental Association.