👉 The term "protomammal" refers to a type of mammal that is not a true mammary gland (a real gland) but rather a part of the reproductive system. Protomamals are often referred to as "progenitors" or "inhibitors," because they have the potential to produce and maintain milk for their offspring, but they cannot produce actual breast milk themselves. Protomammals include: 1. Monosaccharide mammals (e.g., cows