Pigeons. They aren’t the smartest creatures. They fly into glass, thinking it’s an escape route, when clearly the water-stained surface is dirty and obviously not the way out. Besides their small brains, they are actually an attractive bird, their red eyes contrasting their green necks, their gray wings looking soft like felt.
Too bad their beauty doesn’t make up for the tendency to find a way into old buildings and use the rest room everywhere in site.