Here is a video and sound recording that I made today using my iPhone. I am standing near a vernal pool that is full of wood frogs mating. If you turn up your volume you can hear the wood frogs calling. Don't they sound like a flock of small ducks!
Some of these woodlands pools are still ice-covered at one end. The frogs hop on down to the sunny end and spend just a few days calling and mating. The females lay their eggs and then they head back into the surrounding upland where they spend the rest of the year.