I'm going to buy a house in the hills in Los Angeles and it has about 1 acre of land. There are lots of holes that could be from snakes or from something else. 1. Is there a way to determine if there are snakes in these holes? Do snake holes look different from holes from other animals? 2. Besides putting up mesh fencing around the house, is there a way to keep snakes a way? Some scent or something that scares them away? Thanks.