Re: that story Cosmo linked to, we have a particular problem with black squirrels, or rather a particular black squirrel. It’s the only critter which has figured out how to access our bird feeder. We refer to him as “El Squirrelo Negro” though I just looked up the Spanish which seems to be “La Ardilla Negra.” Either way, he is a formidible enemy. That black squirrel is my dog’s white whale.