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Hmmm... It would appear that they adapt not only for survival, but also for ... fun.
I recall a story I heard a couple years ago about how they were having a terrible problem at the st. petersburg cathedral in russia. It seems as though crows would come along, and throw stones onto the (stained glass) roof of the cathedral, because "They like the sound of the glass breaking".
Apparently, in the wild, crows often throw rocks into streams and whatnot, just so that they can hear the "ploop!" noise that it makes.
How much of that is true, I'm not sure, but it's certainly an interesting hypothesis...
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