The pink color, sometimes called watermelon snow, is caused by Chlamydomonas nivalis algae and related species. C. nivalis thrives in cold water, and “snowfields and glaciers are, in some sense ...
As for actually eating it, that’s pretty great, too. Inside its green stripy skin, watermelon’s bright pink flesh is 92% water – and its hydrating juiciness makes it ideal summer fare.