In its limitless wisdom and concern for the earth, the EPA (Epa) has categorized milk as an oil. The oil that they're describing is the animal fat in milk. A cow is indeed an animal, isn't really it? A rhetorical concern certainly. And milk does have 4 % or so milk fat, unless your grocery store option is the 2 % or 1 % variety, or even skim milk from which they got the fat out practically totally.