But some experts say invasive fruit flies can do more damage than the colorful Joro spider, AP News reported. AdvertisementGiant spiders migrating to the Northeast USScientists say Joro spiders are adapted to colder climates like in Pennsylvania and New Jersey. Alex Sanz/AP PhotoThough the massive creatures are venomous, they aren't dangerous to humans beyond potentially causing a swollen, red bite, Sieb told BI. Beyond their size, there's another characteristic of Joro spiders that makes them a little creepy: They can fly. AdvertisementThough they do live close to each other, Joro spiders don't seem to interact much with other individuals, per UGA Cooperative Extension.

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