Are the pink dolphins that live in the amazon river pink because of the water they live in/food they eat or...?

Its actually the blood vessels! Their blood vessels run directly beneath their skin, which is thinner than marine dolphins. So they appear pink, its actually just their blood!

They also have some pink pigmentation, which helps.

They also blush like humans do, when we are nervous or exited, our hearts beat faster, and the blood vessels swell in our faces, and the dolphins do it too when they are happy or exited.

You have mentioned albinism, and its pretty common in these dolphins, although it can be hard to tell which are true albinos, as they can be brown, pink, grey and white. And the albinos are pinky/white.

The dolphins who live in clearer water are more grey, because they loose some of their pigmentation, but ones in muddy water are far more pink/brown, as it helps them camouflage.

They are amazing creatures aren't they!

Pink river dolphins live in the Amazon of South America.

Why Are Pink Dolphins Pink

the food they eat.

The females are usually gray but the males are pink because of scar tissues. Male boto dolphins(river dolphins) are extremely violent and often times get into fights. The more fights the more scars which means the pinker they get. Some males get bright bubble gum pink!.... this is according to a National Geographic article I read.

they ar natrully pink