It is not immediately clear how the hornet made it to the United States, but CNN reported they sometimes travel on worldwide cargo, and it is believed they became active last month after initial sightings because their hibernation is coming to a close.
Researchers were also puzzled by the discovery of Asian giant hornets in Canada last fall.
Asian giant hornets, worryingly dubbed "murder hornets", have invaded the United States for the first time. These hornets can kill humans with several stings, especially when they're in groups and expose victims to venom that's as lethal as a venomous snake's. To make matters worse, their stingers are long and powerful enough to puncture beekeeping suits, too.
The so called "murder hornet" is an Asian Giant Hornet, and has been on the radar of officials since late December when they were first discovered in Blaine, near the Canadian border.
And, well, a video of YouTuber Coyote Peterson letting a Murder Hornet sting him will do nothing to quell those fears.
How long before there is uproar about the name "Asian giant hornet?"
To report a sighting of an Asian giant hornet, contact your state's department of agriculture.
A pair of the up-to-2-inch Asian giant hornets, dubbed "murder hornets", turned up in the USA for the first time last fall in Washington state, The New York Times reported this weekend. The insects kill roughly 30 to 40 people each year in Japan, where they're most common.
With the most obvious advice ever, entomologist Chris Looney of the state Department of Agriculture says,"Don't try to take them out yourself if you see them".
But if the hornets' nests are disturbed, "they will attack with painful stings, which can be hazardous to people's health", according to the ministry. Soon after, they learned that a local beekeeper in the area had also found one of the hornets.
"The Times describes them as having a "cartoonish face" with "teardrop eyes like Spider-Man", orange and black stripes that extend down its body like broad, wispy wings like a small dragonfly".
The buzz of activity inside a nest of Asian giant hornets can keep the inside temperature up to 86 degrees, so the trackers are also exploring using thermal imaging to examine the forest floors. The hornets mostly feed on other bees, biting their heads off and feeding their thoraxes to their young.
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