Here's why:
* Diffuse placentation is characterized by villi (finger-like projections) that are spread out over the entire surface of the chorion (the outermost fetal membrane). This creates a large surface area for nutrient and gas exchange between the mother and fetus.
* Other types of placentation include cotyledonary, zonary, and discoid.
* Cotyledonary placentation, found in ruminants like cows, sheep, and goats, is a specialized type of diffuse placentation. It involves areas of villi called cotyledons that attach to corresponding caruncles (placental areas) in the uterine wall.
So, while ruminants technically have a diffuse type of placentation, their unique cotyledonary structure makes their placentation distinct.