The pink hippo is not considered albino, because its mottled skin still has some pigment (pictured, the hippo in September), the Bronx Zoo's Charlton said by email.
Though most leucistic animals are otherwise normal, they tend to be at an evolutionary disadvantage, Charlton noted.
"In many species this [disadvantage] is due to a lack of camouflage, but in the hippo's case, the lack of pigmentation can be problematic when it comes to protection from the sun," he said.
Sunburn or no sunburn, the photographers wrote, "we hope that it goes on to live a full and happy hippo life, and that visitors to the Masai Mara can continue to marvel at its fetching pink rump for many years to come!"
(Related: "Hippo and Tortoise Pals May Find Three's a Crowd.")