Charlotte Brontë said this quote
“ Swifts, on a fine morning in May, flying this way, that way, sailing around at a great hight, perfectly happily. Then, one leaps onto the back of another, grasps tightly and forgetting to fly they both sink down and down, in a great dying fall, fathom after fathom, until the female utters a loud, piercing cry of ecstasy. ”