Found in trees. Sometimes also in old silent movie theaters, seaside zoos, magic shops, hat shops, time-travel shops, topiary gardents, cowboy boots, castle turrets, comet museums, dog pounds, mermaid ponds, dragon lairs, library stacks (the ones in the back), piles of leaves, piles of pancakes, the belly of a fiddle, the bell of a flower, or in the company of wild herds of typewriters. But mostly in trees.
