The first 35 seconds include dolphin vocalizations: clicks, whistles, and a drum like thumping. Can you hear it?! There were hundreds of dolphins out in the early morning hours of April 3rd. I travelled south with the first group from 115th St. to 80th St. about a mile off of Stone Harbor. I then came in to the surf zone and met up with the second big group and we went from 80th to 50th St. in Avalon.