There are four species of dolphins swimming in Hawaiian waters, there are bottlenose, roughtooth, spotted, and the Hawaiian spinner dolphins. Hawaiian spinner dolphins are the most common. Spinners are five to six feet in length and can weigh up to 200 pounds. Spinner dolphins get their name from their habit of leaping high in the air and somersault spin before reentering the water. With smooth skin and a body with little drag, Hawaiian Dolphins are fast moving creatures. To attain even more speed dolphins will "run" which is going in and out of the water. This skipping along the surface further cuts down on water drag. Dolphins are carnivores, feeding most commonly on large schools of feeder fish. Hawaiian Dolphins like to group feed, which means that its possible to find large groups of Dolphins during mourning hours before they break up from a night of eating. This is the time of the day for a Hawaii Swim with the Dolphins Tour. A swim with the dolphins tour guide will try to quickly get you where the dolphins congregate then get you out in the water amongst the dolphins. Remember its swim with the dolphins, not chase the dolphins. Wild dolphins don't like to be touched, this will scare them away. Wait for the dolphin to initiate interaction. While none of the Hawaiian water dolphins are considered threatened or endangered, there are laws against harassing them. Listen to your swim with the dolphins tour guides, they will tell you more about how to properly swim with the dolphins..