Where have all the snails gone?

Normally we are constantly battling snails. We go out in the summer time at evening and do snail picking as they cross the paths to get to our plants. This spring we would find a few in the building block holes in the blocks along the veggie beds. I would feed them to our turtle, Housie. But since June, I have found about 10 at the most! Where did they go? --Not that I want them back, especially with all my baby plants I have just added to the garden.