I watched a bluecap or blue titmouse feeding her young, whose nest
was in a wall close to an orchard. She got caterpillars out of the
blossoms of the apple trees and leaves of the plum. She fetched 120
caterpillars in half an hour. Now suppose she only feeds them four
times a day, a quarter of an hour each time, she fetched no less than
480 caterpillars.