Look what was on my parents' front door yesterday! It spent all morning there. My mom says it was the size of a hand! Apparently, it's a "fishing spider," capable of walking on water and catching small toads. According to an article in Natural History:
Fishing spiders live throughout the United States, although they're particularly abundant in the South. They lurk along the edges of ponds and streams, and when insects drop to the water, these spiders rush across the surface to attack. They can also dip their legs underwater and grab swimming tadpoles and small fish.
Harmless to humans, but still . . .