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  1. ITV Report

Rare white porpoise spotted off the coast of Cornwall

A white porpoise has been spotted off the coast of Cornwall.

The very rare mammal - known as a leucistic porpoise - was captured by Marine Discovery in Mount's Bay, off Penzance.

It's colouring is due to a condition which means it's experienced a partial loss of pigmentation resulting in white, pale, or patchy coloration of the skin, hair, feathers, scales or cuticle, but not the eyes.

Credit: Twitter / @Marine_Discover

It's not known whether it is the same porpoise spotted off the north Cornish coast in 2016.

The harbour porpoise species have dark grey or brown colouring with a white belly.

Credit: Twitter / @Marine_Discover

There are currently around six known species of porpoises in existence today, according to Whale Facts.

Credit: Twitter / @Marine_Discover

Porpoises also typically grow between five to eight feet long and weigh between 100 and 200lbs, with the larger porpoises weighing over 400lbs.