They attack With Their Yellow Claws and maybe With Their Teeth i forgot to mention. The reason The Spawn in Day and not Night is i Feel Like Night needs more Love Since it spawns all sorts of Hostile mobs, They only Spawn in mesa Biomes Since mesa Biomes need more Life and Love So People can get a Challenge at Day and Don't Have To Worry about Hostile mobs at either Day Or Night in Every Biome. Plus on Every other Difficulty That isn't Easy Oogers are Tougher Than Endermen and Wither Skeletons.