A symphony of frogs 

Here's a video of frog calls shot on a rainy March 2011 night in Oregon. I suspect the species making the calls may be that of the Pacific tree frog, aka Pseudacris (or Hyla) regilla, based on a comparison to known recordings of this species. However, I'm not a herpetologist, just a lowly biology student, so mine would be a semi-educated guess.