These ants are amazing. In order to get home, they needed to bridge a gap between the metal fence and this leaf, which was blowing around in the wind. They built a chain with their bodies and eventually secured the leaf so that others could use the "ant bridge." On a side note, picking up one of these ants (be careful not to smash it) and licking its butt (yes, that's right, its butt, which is green by the way) is a great way to get a full day's supply of vitamin C. (Don't worry, this doesn't harm the ant.)