Hey!! Did you ever figure it out? This has happened to us two years in a row now. It is literally jaw-dropping to have a tree full of pears be stripped without a trace overnight. You just stare and stare and wonder about crazy stuff like aliens. Our pear trees are over twenty-five feet tall. So that outrules deer. The raccoon theory seems kinda plausible but it must have been an absolute swarm to fit four dozen big pears into their bellies and still be able to roll off the property by morning!