Day 68: Alice the mammal has ? humps

The fourth and final installment of our "according to children's songs" set examines the mysterious metamorphosis of "Alice the Camel":
Alice the camel has five humps, Alice the camel has five humps, Alice the camel has five humps,
So ride, Alice, ride.  Boom, boom, boom!
Alice the camel has four humps...
Alice the camel has three humps...
Alice the camel has two humps...
Alice the camel has one hump...
Alice the camel has no humps, Alice the camel has no humps, Alice the camel has no humps
'Cause Alice is a horse, of course.

Evolution? Spontaneous mutation? Close encounter with a Greek god?