You see a fin poke out of the water. It's a big gray animal with a friendly face. It looks like a dolphin, but is it a porpoise? Dolphins and porpoises are simi

An animal with smooth, gray skin jumps from the ocean waves. Its tail waves up and down before it quickly dives again. Did you just see a dolphin? Or was it a p

An award-winning author and whale researcher takes readers into 'the field' for an intimate encounter with some 90 species of cetaceans that make their homes in

"The Porpoise or Dolphin book in the Which Is Which? series helps readers discover the similarities and differences between porpoises and dolphins"--

The eighty-nine cetacean species that swim our seas and rivers are as diverse as they are intelligent and elusive, from the hundred-foot-long, two-hundred-ton b