The episode follows two main storylines involving genetic engineering and sibling rivalry:
: Kyle is heartbroken when his mom won't let him keep his new pet elephant. Inspired by Mr. Garrison's lesson on genetic engineering, the boys try to create a "pot-bellied elephant" by crossbreeding Kyle's elephant with Cartman’s pig, Fluffy. [S1E5] An Elephant Makes Love to a Pig
: Throughout the episode, Stan is repeatedly beaten up by his abusive older sister, Shelley , a subplot inspired by creator Trey Parker’s real-life experiences with his own sister. An Elephant Makes Love to a Pig/Trivia The episode follows two main storylines involving genetic