" THE COUGHBALL of an owl is a packed lump of everything the bird can’t digest—bones, fur, teeth, claws, and nails. An owl tears apart its catch, gulps it down whole, and nourishes itself on blood and flesh. The residue, the undissolvable, fuses. In the small, light, solid pellet, the frail skull of a finch, femur of a mouse, cleft necklace of vertebrae, seed-fine teeth, gray gopher and rabbit fur. A perfect compression of being. What is the essence, the soul? my Jesuit teachers used to ask of their students. What is the irreducible? I answer, what the owl pukes. That is also the story—what is left after the events in all their juices and chaos are reduced to the essence. The story— all that time does not digest. "

― Louise Erdrich , Four Souls