{"fact":"Even crows have a preferred dining height!  They seem to optimize the height they drop whelks from, balancing the number of drops needed with the effort of flying higher.","context":"Zach (1979) concluded that the average dropping height of 5.23 meters could be explained by assuming that crows minimized the total equivalent dropping height (that is, the average dropping height multiplied by the average number of drops needed to break the whelk) for ‘large’ whelks.","source":"Frans Blommaert; Ruud Janssen, Dennett, Darwin, and Skinner Crows, 10.1177/147470490500300113","index":393}