The first fact about the flying spiders is that most species are venomous, while others are not. But the venom of these bridge spiders is not poisonous at all.
They Have Wingless Nature; They DO NOT Have A Flying Organ
Although gray cross spiders are famous as flying spiders, it is worth mentioning that they do not have wings like birds or insects, nor do they possess any organ that helps them in flying.
Another fascinating fact about bridge spiders is that among all the spider families, they are the most active spiders that do not limit themselves to a place.
From the preceding facts, it is entirely clear that flying spiders are not lazy at all. And they do not want to limit their lives to a specific area. Therefore they keep on moving.