The pinche squirrels do this to our Japanese pear tree! They take one single bite out of every fruit on the tree. It’s so annoying! We managed to get 2 whole pears off of the tree last summer. They do the same thing with our peach tree, but we were unable to salvage even a single peach. Of course we could probably get rid of the squirrels if we stopped feeding the birds, but the birds are awesome, and the squirrels are pretty fun to watch.