Well, today I learned that ducks are -- or are prone to becoming -- cannibals. This passage (from the NSW Department of Primary Industries Agriculture website) is particularly chilling:
"Although cannibalism can begin in ducks of any age, ducklings over 4 weeks old are more prone to develop this vice. The underlying reasons for birds turning to cannibalism are not known, but it is associated with boredom..."
Duck cannibalism is associated with BOREDOM, people. Somebody get those ducks some knitting needles STAT.1
Check out this blog entry on Real Clear Science for a firsthand account of duck cannibalism, and here's the horrific "Scientifically Accurate DuckTales" video that sent me down this corkscrew-shaped road to nightmares in the first place.2