These are Zebra Longwing butterflies, the official Florida State Butterfly. These butterflies roost in groups at night, and will return to the same spot each night. I took this photo on a trail in West Palm Beach, Florida. I was walking at night, listening to Screech Owls calling, when I bumped a branch and all of the "leaves" began flying around me. The next night, I returned and photographed them.

Zebra Longwings drink nectar like other butterflies, but they also eat pollen. No other butterflies are known to do that. The pollen is a source of protein, and is thought to give them much longer lives. While most butterflies live about a month, Zebra Longwings can live up to six months. If they are fed only nectar, they live about a month, the same as other butterflies.