The birds have gotten a few of my tomatoes but not too many, and I haven't had any problems with squirrels. But squirrels have ravaged my brother's tomatoes and he is furious. He's tried spraying them (the tomatoes, not the squirrels) with some kind of mint, didn't work, then garlic extract, didn't work and some kind of spray that contained cayenne pepper - also didn't work. So far he hasn't found anything to keep them out effectively, except I think he shot some of the little varmints which did decrease their marauding.   

I really ought to go ahead and pick that big zucchini but I'm kind of zucchinied out!