Oh come on, let's not criticize the dubs for these teachings.
It's totally plausible.
I have horns to prevent contact with others of my species. Once I had my manicurist file them down, and I wound up married.
Sharks used to eat seaweed before Eve sinned. They didn't like it much, so when the dinosaurs came to the water for a drink, they ate the dinosaurs. That's how they became carnivores. This is a totally true fact and here's my reference.