{"fact":"Crows seem to know that bigger isn't always better when it comes to opening whelks. Smaller whelks contain less energy and are harder to crack open by dropping.","context":"Small whelks represent less energy to the crow, and they also break less easily when dropped (Zach, 1979).","source":"Frans Blommaert; Ruud Janssen, Dennett, Darwin, and Skinner Crows, 10.1177/147470490500300113","index":391}