On a spent geranium blossom. Smaller than a thumbnail, green crab spiders feed on bugs. They bite and suck hem dry. Females can switch colors, sometimes even to white. He re venomous but the poison is too weak to affect humans. They are common in summer, although a full albino is not often seen. Image: Andy Frank
Another view. Why called crab spdiers? Like ocean crabs, they can scamper sideways. But very fast.