Judging by their size and strength, it's reasonable to assume that these animals were one of the gorilla species. Male gorillas weigh anywhere from 350 to 600 pounds. Both "Silky" and "Chopper" were jumped on by these creatures several times. A creature that heavy jumping on a man would likely kill him; about the best he could hope for would be serious injuries. Yet at the end of the episode, "Silky" and "Chopper" are apparently unharmed. "No actors were harmed during the production of this cartoon!"