{"fact":"Crows don't always go for the biggest whelks.  They consider how long it takes to find a large whelk versus the energy they get from eating it.","context":"Choosing this minimum acceptable whelk weight too high may then result in extremely long search times. To model the process of searching for a suitable whelk, we have assumed that a crow will search for a whelk, selecting one whelk at a time and rejecting it when its weight is below a certain minimum acceptable weight.","source":"Frans Blommaert; Ruud Janssen, Dennett, Darwin, and Skinner Crows, 10.1177/147470490500300113","index":390}