Very young humpback whale calves in the southern hemisphere (Megaptera novaeangliae australis) are sometimes quite light in coloration, appearing nearly white/ grey-white as seen here.
Sometimes, calves maintain this hue as they mature. Most often though, darker pigmentation emerges as calves grow.
I have seen a number of stories of supposed sightings of albino humpback whale calves in the southern hemisphere. Needless to say, I am always skeptical. The likelihood of an actual albino birth is so much less than the normal light-gradually-turning-dark pigmentation pattern that the burden of proof for an albino is high.
In any case, the calf pictured here is young. Its form is clearly recognizable as a humpback whale, but the front end is kind of short, in a cute baby way. As humpbacks mature, their proportions fill-out, just as is the case with other mammals (think of puppies growing into adult dogs, or human babies vs. adult people).
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