Wtf is Udyr?

I've seen a few laning udyrs recently and I have no idea how to counter them. I was playing as sion and he destroyed me as soon as he got level 2, with a flash under tower and survived. He didn't leave lane and stayed with 100 hp, as soon as I go back up he kills me AGAIN, while I'm full hp with an item advantage with 100 hp. Seriously, how do I do anything against a champion who can 700 - 0 me with 100 hp and first item?
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