Haha sorry, I realize this level is a bit confusing. For the deers, you have to first join the group (place yourself within the group and they'll start running). Wolves will attack the pack and you have to defend them by simply running into the wolves (you'll hit them automatically). At the some point the deer will arrive at their destination and you'll get to the next zone. Thanks for the feedback!
The game's page also provide some tips to understand this level.