What exactly are Rocky Mountain Oysters?

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Why: In a deep discussion of livestock testicles, many kinds of "oysters" were named. I asked, "Are 'Rocky Mountain Oysters' goat, sheep, or pigs?" and Butch said, "All."

Answer: Rocky Mountain oysters (sometimes called prairie oysters) is a North American culinary name for edible offal (animal entrails), specifically buffalo or bull testicles. They are usually peeled, coated in flour, pepper and salt, sometimes pounded flat, then deep-fried. This delicacy is most often served as an appetizer.

Source: Wikipedia

The More You Know: In Spain, Mexico, and South America, they are referred to as "criadillas" or are colloquially referred to as huevos del toro (literally "bull’s eggs"). Rocky Mountain oysters are sometimes confused with lamb fries or animelles (lamb testicles), which are served in a similar manner. They are called by other descriptive terms such as "cowboy caviar," "Montana tendergroins," or "swinging beef."