[Scarlet Tanager "anting," Ken Lockwood Gorge, Hunterdon County, NJ, June 15, 2016. Birds of many species have been seen allowing ants to patrol their feathers, perhaps to take advantage of the defensive secretions of the ants. Click to enlarge.]
"When you have seen one ant, one bird, one tree, you have not seen them all."
- E. O. Wilson