Learn how dolphins came into being and how taxonomists
classify the different species.
Dolphins are mammals, and as such, evolved from terrestrial creatures. On
this page you can find answers to such questions as: How and why did they
reenter an aquatic existance millions of years ago? When did the numerous
adaptations that help them to survive in the water develop? What were the
first cetaceans like?
Oceanic dolphins include at least 26 different species, and that's not
counting river dolphins and the smaller, toothed whales that belong to the
same family as dolphins. In this section, learn how taxonomists classify
the many species of dolphins. Information on the characteristics of each
species is included.