San Francisco 49ers head coach Jim Harbaugh -- who looks almost unrecognizable without his trademark 49ers cap, black sweatshirt and khakis -- went to Six Flags Discovery Kingdom in Vallejo, Calif., over the weekend.
It was there that Harbaugh, probably starved for competition in the off-season, challenged Siku the walrus to a push-up contest.
Siku isn't Harbaugh's only new friend. He also stole a kiss from a sea lion and bottle-fed a tiger.
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