Most likely dolphins do not dive very deep though. Many bottlenose dolphins live in fairly shallow water. In the Sarasota Bay area, the dolphins spend a considerable time in waters that are less than 2 meters (7 feet) deep. Other whale and dolphin species are able to dive to much greater depths even.
Ring-tailed lemurs. The order Primates includes humans, apes, monkeys, and prosimians. Many of them may be familiar, but it would not be surprising if you cannot immediately visualize prosimians (like the ring-tailed lemurs in the picture on the right). How many living primate species exist today is not clear.
For the most part, nonhuman primates are research subjects because they are so similar to humans, and the principal reason for this similarity is simple: humans *are* primates. Current ideas are that the first primates appeared more than 60 million years ago.