How many mammals have 4 knees?

Question

How many mammals have 4 knees?

Answer 1

Most 4 legged ones.  

Answer 2

The Elephant is the only critter with four knees.

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If you google your question you will see this question has been asked on Q&A before.

Good question, never gave it much thought.

Answer 3

i'm more inclined to say none. remember, the bending part of four-legged animals' hindlimbs are really ankles. the bending part of the forelimbs are "elbows". however, horse people will call these the knees.