The tide was coming in working against the river flowing out. A group of about a dozen Dolphins worked up and down the mouth of the river giving fleeting glimpses of fins, tails, and head bobs, mostly out in the middle of the river.
Dolphins hunt for food cooperatively and I have seen pairs and groups of 4 or 5 working together. Often it is hard to tell how many because they aren’t visible at the same time and can travel long distances under water. This pair showed off a few elegant moves before they went on their way.
Folly Beach County Park, SC.