Sal posted his first lessons on YouTube in 2006. He joked that "YouTube is for cats playing piano. It is not for serious mathematics."
Today, the cats on YouTube are still playing piano, AND doing serious mathematics. #nationalkittendaypic.twitter.com/sRPGM5T9Iw
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I would suggest for all feline family. Lion and tigers and Lions have difficulty in calculation of height of the tree and how much traction is needed.

pic.twitter.com/lDKJt7KOY0Thanks. Twitter will use this to make your timeline better. UndoUndo
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