A couple of crows at our local railway station have apparently learned, possibly the hard way: The very carefully pick through the litter bins, making an obviou

A couple of crows at our local railway station have apparently learned, possibly the hard way: The very carefully pick through the litter bins, making an obvious effort not to spill anything on the pavement. A less conscientious mate of theirs has impressed me in a different way. Surveyed a bin, chose a papercup and threw it on the ground. Extracted crumpled plastic bag from cup. Straightened bag, went around to the bottom end, picked it up, and determinedly shook out remains of sandwich. All extremly controlled and clearly planned, no hint of trial and error.