It must be spring, the toads are singing! I love to listen to them. http://twitpic.com/4aim14
Here is a link that might be useful: Singing toad
You take pictures of spiders and snakes too and your cat looks like Spanky who was just "helping" me. I counted 14 but they were more under the rocks making a deafening noise. Spanky didn't hurt the toad.
These are great shots; I can't imagine catching them "in the act" so to speak.
About 4:30 each evening, I hear the frogs very loudly from the various ponds in the neighborhood.