I think Oakley is right... they come and go, and Dewayne, the better your garden is doing the more will come along.
I have sung the praises of row cover but critter populations are on the rise since last year when I grew many tomatoes outdoors, and composted a load of green fruit. And I've been careless... Came home this evening and my little "bean tent" had slumped to the ground again - not properly secured. Oh well. Then I happened to glance out the window and there is a squirrel at the end of my bean row, eating the LEAVES off a bean plant like it was the only food on earth.
I mean stuffing it fast!!!!
I banged on the window and he scampered off. By the time I got out of the back door he was back - standing there with one foot raised over the slump of cloth. The nerve!! I shooed him off and pulled up and secured the cloth, but it is not secure enough to stop him if he is bold enough to sneak under.
Soooo...enclosure building time has crept up on me... with a bushy tail.