The 40 or so species of dolphins are members of 5 families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the New World river dolphins), and Pontoporiidae (the brackish dolphins), and the now extinct Lipotidae (baiji or Chinese river dolphin). Test your skills by identifying them from a single photo below. 

Best of luck! 

Want to brush up on your dolphins? Review our species profiles at: Whales & Dolphins ;-)

Think you know your sharks? Sharks comprise 512 described and 23 undescribed species in eight Orders... here's just 49, good luck! Tip: be as specific as possible, close only counts in horseshoes :-) 

Want to brush up on your sharks? Start here: Sharks & Rays ;-)

Who doesn't love cephalopods? All those arms, tentacles and suckers and obvious intelligence (smarter than cats some say!) 

Prepare to be even more impressed... or you could brush up on your cephalopods beforehand here: Squid & Octopuses ;-)