by Geza Bruckner
Human and mammalian milk, a key source of early infant nourishment, has evolved as a result of 200 million plus years of Darwinian pressure on mammalian lactation to become the near perfect species specific neonatal food.
The composition of milk varies dramatically between species. For example, seal milk has evolved to contain 50 percent fat to provide high energy nourishment in an extremely cold environment for baby seals compared to 4.5 percent fat in mature human milk. Most carnivores, for example cats, produce milk containing 10 percent protein compared to 1.4 percent for human milk. Read more.