A Leucistic Hummingbird generally has white, off-white, or tan plumage. Their eyes, beak, and feet are black showing normal pigments on these body parts. An albino is always pure white. The eyes, feet, and bill of a true albino are pinkish. This indicates it has no pigment (melanin) at all.
A theory among scientists is that this rare albino hummingbird does not make it through the migration due to a number of disadvantages:
Color alone can possibly be a problem. Perhaps the white feathers are much too visible to predators.
Possibly these feathers are brittle and break more easily.
There might even be some genetic factors that weaken the bird before the natural life cycle of reproduction can allow for more albino hummingbirds to be born at all.