I strongly recommend this build for a strong tank udyr wich will help team to stay alive and win team battles, i jungle as tank Udyr just so we can have free solo lanes at mid and Top while im jungling so we keep 3 high lvls in team. That will make you have the "upper hand" in your team battles.

I use smite for jungle and ghost to make it easier to get behind your targets faster when ganking early game, ghost + bear form.

I max the turtle stance up as fast as possible to make the ganks easier and tower dives better in early game to score some kills.

Wriggle's Lantern --> Ninja Tabi --> Randuin's Omen --> Thornmail --> Warmog's Armor --> Force of Nature