The first movie I saw was back in the 80's - it's about a teacher and her students who are being chased by 3 or 4 men who wear animal masks (pig, dog, cat etc.). by the end of the movie the children end up running up some sort of mountain and kill the men that have been chasing them I believe in a cave. that's all i really remember. i believe the movie starts with the teacher and students in a class and the men come to kidnap them or they go on a field trip. i'm not too sure.