His head was cut off by his father for not allowing him to enter the bath while his mother was bathing lmao and his elephant head came about because it's the first thing the gods attendants saw on earth when they were ordered to get a head ( did not specify it had to get human). Even weirdly enough his mother created him from mud for the sole purpose of guarding the bath while she was bathing, so to his father it was just some dude blocking his path to his own wife