Saturday, March 4, 2017

The Seedy Habits of Bird Feeders

obsessive bird feeding photo courtesy Monitor Pest ControlIn seedy neighborhoods across the U.S., ordinary people are shelling out hard-earned cash to feed a habit of near-epidemic proportions. The fact of the matter is, about 40% of American households are addicted to feeding birds. Things are even worse in the U.K., where close to three-quarters of the population are beset with this malady.

In severe cases, people provide birds with dried fruit, suet, and mealworms, and even landscape their yard with bird-friendly trees and shrubs. Most garden-variety bird-feeding addicts, however, go to seed. It often starts innocently: a few sunflower kernels strewn in the backyard or a handful of popped corn scattered for chickadees. But these so-called gateway activities can quickly escalate, and decent folk may soon find themselves sneaking out on Saturday mornings for a weekly fix of thistle seeds, millet, milo or suet.

The question is, why would anyone want to crack the birdseed habit? Watching native songbirds at a backyard feeder is a soothing pastime, and especially during winter, it provides “cheep” entertainment. For children it can be educational, as well as a means for them to connect with the natural world in rural and urban areas alike. And during harsh weather like extreme cold or ice storms, bird feeders can make a real difference in terms of survival. A Wisconsin study found that even in an average winter, survival of black-capped chickadees increased from 37% to 69% when they had access to feeders.

Although feeding birds is on the whole very beneficial, it can pose hidden risks. Feeders bring together various bird species that would not normally have contact with one another, and tend to attract them in high numbers. Under such conditions, pathogens can be readily passed around. Recent outbreaks of mycoplasmal conjunctivitis, a contagious eye disease, and a deadly respiratory illness called trichomoniasis, have killed thousands of songbirds. Aspergillosis and avian flu are other potential dangers.

Fortunately, these risks can be minimized, beginning with basic food-safety standards. I like a free all-you-can-eat buffet as much as the next person, but if no one cleaned the salad bar or washed the steam trays for months on end, my enthusiasm would start to wane. The Cornell Laboratory of Ornithology recommends scrubbing bird feeders, followed by a 10% bleach solution rinse, every two weeks.

A virtue in other contexts, inclusiveness is a problem in bird feeding. The Audubon Society points out that birdseed mixes lead to excessive waste and spoilage, a source of contamination. It is best to maintain a separate feeder for each type of seed. Not only does this cut down on waste, it reduces the number of species at each unit, helping to curb disease transmission.

Black oil sunflower seed is like watermelon at a picnic—everyone in the neighborhood is going to line up for it. If you have just one feeder, black oil seed will attract the widest variety of birds. Its popularity can occasionally lead to problems when bullies such as blackbirds hog the feeder and kick out other species. If that is the case, try switching to striped sunflower seed, which are not as attractive to grackles, starlings and cowbirds. The only thing is that striped seed may be harder for smaller birds like chickadees and nuthatches to open.

Thistle seed, also called Niger or Nyjer, is a tiny oil-rich seed favored by goldfinches, house and purple finches, redpolls and pine siskins. Because thistle requires a special feeder with narrow openings, jays and blackbirds can’t get at it. Don’t worry about having a yard full of thistles, though—Niger seed is heat-treated and will not sprout.

Cardinals and grosbeaks are fans of safflower seed, which has a hard shell and is therefore (at least slightly) less attractive to squirrels. Safflower is typically presented in tray-type feeders. White millet is eaten by juncos, cardinals, mourning doves and other ground-feeding birds. It is often spread on the ground or in tray feeders.

Cracked or whole corn will bring in larger species like grosbeaks, crows, grouse and turkeys. Unfortunately, it is also more attractive to deer, raccoons, and bears than other types of bird food. The big problem with corn is that, as outlined in a Cornell Ornithology Lab factsheet, “Corn is the bird food most likely to be contaminated with aflatoxins, which are extremely toxic even at low levels. Never buy corn in plastic bags, never allow it to get wet; never offer it in amounts that can’t be consumed in a day…” Peanuts are another item that often harbors these toxins.

One other source of illness is spoiled bread and other people-food put out for birds. Cornell, Audubon, and other birding groups strongly warn against the practice.

The Audubon Society’s Christmas Bird Count, started in 1900, relies on volunteers to tally birds in their area. The results of this year’s count have not yet been made public, but Jeff Bolsinger, coordinator of the Canton-Potsdam bird count, said his group identified 41 species, down from the typical 45 to 50 species. Population-wise, starlings and rock pigeons topped the list, but the group also spotted black-capped chickadees, American goldfinches, dark-eyed juncos, American robins, northern cardinals, white-breasted nuthatches, and various woodpeckers in significant numbers.

I’m all for efficiency, but no one wants to run a combination bird/ cat/ squirrel feeding station. A recent innovation, simple and elegant, has made it easy to curb feline delinquency. Instead of belling the cat, you just give it an unattractive collar cover, or “bib.” Birds, apparently, are horrified by poor fashion taste, and will flee from garish colors and clashing patterns. I would not have predicted this, but studies show that loud attire reduces predation more effectively than a loud noise. Take note of how you dress when you go out birding.

As for squirrels, which by the way will eat birds if they get a chance, it is not so simple. I have had two squirrel-resistant feeders for about fifteen years, and to date they have never been breached by a fluffy-tailed rodent. Squirrels have chewed on the metal grate and even cut the line holding the feeders, but nothing more. Of course if they come to glean spilled seed, they are hard to stop. Except maybe with a cat.

Photo courtesy Monitor Pest Control.

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Paul Hetzler has been an ISA Certified Arborist since 1996. His work has appeared in the medical journal The Lancet, as well as Highlights for Children Magazine.You can read more of his work at or by picking up a copy of his book Shady Characters: Plant Vampires, Caterpillar Soup, Leprechaun Trees and Other Hilarities of the Natural World

One Response

  1. Boreas says:

    That’s one attractive rat! Well fed with a glossy coat.

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