* Gray is the most common color for dolphins, and it is found in many species, including the bottlenose dolphin, the common dolphin, and the spotted dolphin.
* Black dolphins are also relatively common, and they include the killer whale, the pilot whale, and the false killer whale.
* White dolphins are less common, but they do exist, such as the beluga whale and the albino bottlenose dolphin.
* Pink dolphins are extremely rare, and they are only found in certain parts of the world, such as the Amazon River and the Gulf of Mexico.
In addition to these main colors, dolphins can also have a variety of other markings, such as spots, stripes, and bands. These markings can vary in color from black to white to yellow.
The color of a dolphin's skin is determined by a number of factors, including the species of dolphin, its age, its sex, and its environment. For example, bottlenose dolphins are typically born gray, but they gradually turn darker as they age. Male dolphins are also typically darker than female dolphins. And dolphins that live in warmer climates tend to be lighter in color than dolphins that live in colder climates.