Wolves Howling At Moon

Whenever there is a full moon and there is a untamed wolf it will howl at the moon and slowly more and more wolves will spawn next to it until there are 10 to 20 wolves in a pack. The pack always stay and travel together and wolves only leave to hunt. When a wolf kills prey it will hold the meat in it's mouth and either eat it or give it to another wolf in the pack who will eat it. There is a animation of it howling where it points it's nose up to the moon and makes a loud howl. If you tame one wolf from a pack every single wolf in that pack will become tamed. But if you seperate one more than 50 blocks from it's pack it will teleport right back to the pack even if they're tamed (if it is sitting it will not teleport back).