Sequence of peregrine falcon diving to catch a grouse, Sutherland, Scotland. At the top, thfalcon, having sighted the grouse (which has been put up by the falconer's two pointers), peels off to dive. It kicks its wings to increase speed, and then tucks them back for a better aerodynamic shape as it goes into the stoop (the near-vertical dive in which it can reach speeds of up to 100 kph).