@Riot, before you nerf Udyr because of his win rate
Try to do some research and decide if Udyr's too strong, or Zz'rot is too strong. Udyr's win rate fell down quite hard after Zz'rot is disabled (55% to 51%, just 1 day of data though, may need more data). Aside from Zz'rot, a lot of people played Jhin, who is quite an easy target for Udyr because of Jhin's lack of mobility.
Just a request, please research Udyr's current power before you actually make changes to him. Thanks.
I've decided to copy some arguments from comments here just so people can read easier.
Based on champion.gg, Udyr has lower kill, lower assist, and lower damage dealt, while having a ridiculous amount of death. That should explain that he does barely anything in the game other than split push. I don't see how that completely justifies nerf on Udyr.
Another thing I find amusing is Nasus. With Most Frequent Core Build (Frozen Heart, Spirit Visage, Trinity Force, Dead Man's Plate, and Banshee's Veil) he achieves only 49% win rate. Once Banshee is replaced by Zz'rot, his win rate spikes up to 55%. Another champion is Sion. Without Zz'rot, his most frequent core build only achieves 50% win rate. Stick a Zz'rot in there, it goes up to 54%. Unfortunately, Sion's case is from a very small pool of 29 games. Nasus' size pool is around 500 though.
Does it warrant a nerf on Zz'rot? Probably not right away, but definitely something to look into. Should Udyr not be nerfed? I didn't ask for that. I asked to reconsider. If they think Udyr should be nerfed, then sure. But if the nerf is solely based on win rate, then there are some datas that proves it's (probably) not Udyr's power that is the cause of his massive win rate, it's (probably) Zz'rot.
Udyr is the third worst jungler in terms of damage dealt.