Search of the Week: “it is september why am i only getting female hummingbirds at my feeders…”

In juvenile plumage, young male hummingbirds like this Ruby-throated usually look a lot like their mothers. They also seem to leave the nest with chips on their shoulders.

In juvenile plumage, young male hummingbirds like this Ruby-throated usually look a lot like their mothers. They also seem to leave the nest with chips on their shoulders.

The full search was: “it is september why am i only getting female hummingbirds at my feeders and she is very aggressive”

By September, most of the migratory hummingbirds remaining at northern latitudes will be young birds of both sexes, which look like adult females except for variable amounts of pale fringing on the iridescent feathers of their backs and heads (plus a few other subtle differences, depending on species). Young males often show lines of dark spots on the throat, a pattern hummingbirders call “five-o’clock shadow.” Some young males will show bright flashes of color in their gorgets as adult feathers replace drab juvenile ones.

Though females of any age can be very aggressive and territorial, especially in migration, it’s the young males that seem to be the biggest troublemakers (as though they think they have something to prove). As long as there are still good numbers of hummingbirds around, expect the screeching, chasing, grappling, and chest-bumping to continue.

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Keeping hummingbird feeders clean

Hummingbird Feeder Cleaning Kit

Brushtech Hummingbird Feeder Cleaning Kit at Amazon.com (click image)

If you’re like me, you’ve got a collection of toothbrushes, baby bottle brushes, and even well-washed mascara brushes sitting next to your kitchen sink for cleaning hummingbird feeders. The problem is that tools made for other cleaning jobs don’t always work as well for such a specialized task, so it’s nice to see a set of brushes made especially to reach the nooks and crannies of typical hummingbird feeders. The big brush in this set could even get into the enclosed bases of some of the cheapo feeder models to remove crud you can’t see.

Of all the nasties that grow on hummingbird feeders, the nastiest and hardest to control is black mold. A 15-minute soak in a dilute solution of chlorine bleach*⇓ (1 part bleach in 10 or more parts water) is very effective at killing black mold on non-porous surfaces, but an hour-long soak in white vinegar is a less toxic alternative (NEVER use bleach and vinegar together: you could kill yourself!). In either case, follow up the soak with a thorough brushing to remove dead mold colonies and other organic growths, then rinse well and let the feeder dry before refilling to allow the odor to dissipate.

An even safer mold killer that’s much kinder to your nose than bleach or vinegar is 3% hydrogen peroxide, the medicinal kind you can buy in any drug or grocery store. The downside is that it’s much more expensive than bleach or vinegar. A frugal alternative to traditional soaking is to add a couple of ounces to the feeder bottle, screw on the base, invert the feeder and swirl gently over a sink or bucket to make sure the peroxide covers all inside surfaces, then allow it to stand for at least 10 minutes. While the peroxide is doing its work from the inside, spray the outside with more peroxide to kill any mold growing there. Follow the treatment with a good scrub, including the ports. and rinse well to remove any debris. No drying needed; the peroxide will leave no odor, and the only residues are water and oxygen.

This advice applies mainly to bottle-style feeders. Saucer feeders such as the Aspects Hummzingers can be cleaned by hand using dish detergent and the small port brush in the kit above or washed on the top rack of the dishwasher. If any stubborn debris accumulates in the built-in ant moat, the little ball-shaped brush in the Brushtech set will swish it away.

Regardless of what type of feeder you have, it will need cleaning and refilling every 1 to 3 days in hot, windy, and/or rainy weather and every 4 to 6 days in cooler, calmer, drier weather, whether the birds have emptied it or not. If you can’t make a commitment to good feeder hygiene, it’s best to plant flowers instead.


* There’s a persistent myth that using chlorine bleach to clean feeders will kill hummingbirds. It won’t as long as you rinse the feeder well, just as you would if using bleach to disinfect your own dishes or your pets’ dishes. Any minute traces of chlorine residue will be rendered harmless by reacting with the sugar in the feeder solution (the same thing happens when you mix sugar with chlorinated tap water).