It's a learned skill rather than a genetic trait, though. It may well be that the birds that use the cars to crack nuts are more intelligent, thus they survive to make more birds. What will happen to them if the sequence of the lights change or we run out of oil is another matter.*
*We'll probably start hunting birds for a start.
(*We'll probably start hunting birds for a start.
Smallbrainfield,
Wed 26 Sep 2007, 13:06,
archived)