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Nothing they are the same...
whales and dolphins both have fins, but dolphins are much smaller than whales
In Greek Mythology it is thought that dolphins were once humans and were turned into dolphins for there sins. But other than Dolphins being smarter than most animals there is no similarities
They are both mammals
analogous
Dolphins breathe with lungs while sharks breathe with gills.
Penises.
Similarities: * Whales, dolphins and fish are all vertebrates * They all need to live in water and cannot survive out of water for long * They all have a streamlined body shape, with dorsal and pectoral fins Differences: * Whales and dolphins are mammals, but fish are simply classified as "fish" * Fish have scales (even a shark has fine scales); whales and dolphins have smooth skin * Fish breathe through gills; whales and dolphins use lungs and a blowhole, which really functions like a nose, on top of their heads * Most fish lay eggs, while whales and dolphins give birth to live young * Fish are cold blooded; whales and dolphins are warm-blooded * Swimming motions are different: Fish moves through the water by using their body muscles to push their tails side-to-side; whales and dolphins move by pushing their tails up and down
that they share a common ancestor
The difference between dolphins and octopus is that dolphins have skeletons and octopuses don't! There are many differences between a dolphin and an octopus such as an octopus has tenicles and dolphins dont. Plus they eat very different diets. Octopuses may eat plankton while the dolphin eats small fish
Blue whales aren't related to bottlenose dolphins, they are simply two different sea mammals with some similarities.
i do not have any idea