What are cetaceans?
Whales, dolphins and porpoises all belong to a group of marine mammals called cetaceans (from the Latin word cetus which means ‘large sea animal’ and the Greek word ketos which means ‘sea monster’).
Presently there are 80 recognized species (this may change as we learn more about these animals) which exist in a wide range of sizes, shapes and colours. Although they are called marine mammals and can be found in all oceans from the poles to the equator some (eg the river dolphins) do not live in the ocean but in several of the major rivers in Asia and South America.
They are actually most closely related to the hippopotamus. Click here to read more about this at www.ultimateungulate.com.