Big Bertha

Big Berthas are huge mouth-brooding Cheep Cheep that live deep in the sea. She has a counterpart called Boss Bass.

Mario Is Missing!
Big Berthas appear in the game Super Mario Bros.. Big Berthas always carry Baby Cheeps in their mouth, occasionally letting them out. After a few seconds, the baby will return to its parent's mouth. If Mario or Luigi swim in her way, she may passively eat him (unless he's in fire form).

Nintendo Comics System
Bertha, a character influenced by the Big Bertha species, plays a prominent role in two Nintendo Comics System stories. In her first appearance, Love Flounders, she falls in love with Frog Mario after being tricked by Stanley the Talking Fish. She eventually realizes Stanley was lying, but is consoled by Mario, who states he wants to be friends with Bertha, not lovers. Bertha later reappears in Fins and Roses, this time dating Stanley. She foils Wendy O. Koopa's plans by knocking the Koopa's bomb back at her.

Trivia

 * A character named Big Bertha was featured in the Super Mario Bros. movie. Like the fish in the game, she wore all red, and like the character in the comics, she had a crush on Mario.