Molech/Moloch has always been represented as a bull. Owls are symbols of the secret wisdom of the "illuminated".

As Mark Dice explained in his book "The Bohemian Grove: Facts and Fiction":

The Bohemian Grove’s mascot (and logo) is an owl, or more specifically, the Owl of Minerva (or Athena, the Greek equivalent), who is the Goddess of wisdom. Interestingly this is the same symbol that Adam Weishaupt, founder of the Illuminati, used as his personal emblem as well. Within the Bavarian Illuminati in Germany, Weishaupt had also created a level in the hierarchy called the Minervals. An owl symbolizes wisdom because it can “see in the dark” which is analogous to being enlightened.