Raptors

 If Velociraptors roamed around in the wild just like deer, I think the human population (or any population) would be a lot lower. But keeping schools safe would be a struggle. Some rules I would put down would be no feeding the raptors food and I would have a 50 ft tall, raptor prove wall or really big fence around the school area so the raptors can't get in. If a raptor does get in somehow we will all quietly go down to a really big room that that has a lock that we can lock behind us, because according to Jurassic Park they can open doors. Also there will be a rule that no student will go outside of the wall or fence until granted permission. Raptors are dangerous, so there must be many precautions taken.