from The Century Dictionary and Cyclopedia
- n. A Gangetic dolphin; any member of the Platanistidæ. See cut under Platanista.
Sorry, no etymologies found.
They seem pretty normal rather than the coloring and the Amazonian pink dolphins (also called Amazon River Dolphins) are larger than any other river-dolphin type.
Also known as 'The Goddess of the Yangtze' the shy river-dolphin had roamed the river for millions of years locating fish with echolocation.