Why are there pink dolphins?

There's a bit of a misunderstanding here! There are no pink dolphins. What you're likely thinking of is the Amazon River Dolphin, also known as the Boto.

While they are often referred to as "pink dolphins", their color isn't actually pink. They are grey when they are born, and their skin gradually turns a greyish-blue or even pinkish as they age.

Here's why they appear pink:

* Blood vessels: The boto's skin is very thin and their blood vessels are close to the surface. This makes their skin appear pinker in areas where the blood vessels are more prominent.

* Sunlight: Exposure to sunlight can also contribute to the pinkish hue.

* Water conditions: The water conditions in the Amazon River can also affect the boto's color, making them appear more pink in some areas than others.

So, while the boto isn't truly pink, its unusual color is due to a combination of factors, making it one of the most fascinating and unique creatures in the world!