A single bald-faced hornet colony can house 400 to 700 workers, making it the biggest in its genus, and builds a hanging paper nest up to 58 cm (23 in) long. The same source notes nests can reach 60 cm in height and 45 cm across, while field observations record nests from 0.3 m to 20 m (1 ft to 65 ft 7 in) above ground.
Bald-faced hornet colonies live just a few months: in Washington they start mid-May and end mid-September, a 122-day cycle; Indiana colonies run about 153 days, and California nests survive 155-170 days. An Oregon colony was still active on 28 Oct 2022, showing the cycle can stretch into late autumn in milder climates.
When a predator or human gets too close, workers don't just sting, they can spray venom directly into the eyes of the intruder. The venom causes immediate watering and temporary blindness. This eye-spraying defense is unique among social wasps and explains why encounters with a bald-faced hornet nest feel especially dangerous, prompting people to keep a safe distance.
About one-fifth of the males in a bald-faced hornet colony are produced by workers, not the queen. In a study of seven nests, 20.9 % of males came from worker-laid eggs, and this proportion didn't change with nest size or collection time. Because workers are more related to their own sons than to the queen's, they can gain a genetic edge by reproducing, revealing a subtle but real conflict that can shape colony dynamics.
Bald-faced hornets are voracious predators, eating flies, caterpillars, spiders and even other yellowjackets, while also sipping nectar and fruit pulp. This dual diet makes them valuable pollinators and pest controllers: they help pollinate flowers and curb insect pests that damage crops. Their habit of hunting insects and visiting blossoms links them tightly to both plant reproduction and agricultural health.
Sources
Every fact above was checked against these pages, and kept only where one of them states it.
In the warm, golden light of summer, the bald-faced hornet dances through the air with a mesmerizing blend of elegance and menace, its sleek, black-and-white body a masterclass in streamlined design. As it moves with purpose, its paper-like nest a testament to its industry and social complexity, this wasp weaves a intricate narrative of cooperation and survival, its very existence a reminder of the beauty and fascination that can be found in even the most unexpected of creatures. With each swift, agile movement, the hornet embodies the essence of a summer's day, full of life, energy, and unbridled vitality.
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