As leaves drop from the trees in autumn, sometimes their absence can reveal a previously camouflaged surprise -- like a bald-faced hornet nest.
Bald-faced hornets are named for their ivory-white face coloration. (They are also sometimes called white-faced hornets.)
Bald-faced hornet nests often grow to basketball size or larger. Peak nest populations are 400 or more workers. The nests are paper and have a single opening where the bald-faced hornet workers enter and exit.
Geographically, bald-faced hornets are found on the west coast of the United States, in the Rocky Mountain areas, and throughout the Eastern half of the U.S. They are most common in the southeastern U.S. Bald-faced hornets are also found in Canada.
Bald-faced hornet nests are started by a single queen in the spring, once she emerges from hibernation. She collects wood fiber and chews it to produce a paper-like material to build the nest. As she constructs the inner cells, she lays an egg in each. The eggs mature into larvae, pupae, and then workers who forage for food and building materials to keep growing the nest until the season slows down in fall.
These photos are from Laura in Spokane, who reports finding this bald-faced hornet nest the size of a human head in her yard in late October.
Although it was past the point of being active with workers coming and going, the nest wasn't fully abandoned, as there were larvae inside some of the cells. "When it was down and being smashed and sprayed," she said, "a few were actually pretty squirmy. Ick!"
Even if you find a nest like this late in the year and leave it up, the good news is that the insects will not use it again. Instead, the overwintering bald-faced hornet queens will build a new nest in spring.
By Delilah Onofrey, Suntory Flowers
Photographs courtesy of Suntory Flowers
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