Big Fire Piranha

Big Venus Fire Traps (previously known as Piranha Flowers ) are enemies first appearing in Super Mario 64. They are Fire Piranha Plants with one big difference: Big Venus Fire Traps have bloomed to an enlarged state, and their fireballs are often comparatively larger as well.

Super Mario 64 / Super Mario 64 DS
In Super Mario 64 and its remake, Super Mario 64 DS, they are the target of the first mission of Tiny-Huge Island: Pluck the Piranha Flower. Five of them appear in this mission. Like regular Fire Piranha Plants in this game, they blend in the grass at first. When Mario approaches, they grow in size at an alarming rate, spit a fireball, then quickly shrink back to their invulnerable selves. All of them appear in one area, and they must be punched to obtain a Power Star. In Super Mario 64 DS, another way to deal with them is by using a Super Mushroom hidden in one of the three wooden pegs in the same area. Once defeated, they shrink like a normal sized Piranha Plant before leaving Mario with two coins.

New Super Mario Bros. Wii
In New Super Mario Bros. Wii, only two are found in World 2-3.From this game forward, they can be defeated by shooting three fireballs at them or by using a Super Star.

New Super Mario Bros. 2
One reappears in New Super Mario Bros. 2, in World 5-6. Rather than shooting large fireballs, they shoot out normal-sized ones like their smaller counterparts.

New Super Luigi U / New Super Mario Bros. U Deluxe
After an absence in New Super Mario Bros. U, they reappear in New Super Luigi U in Piranhas in the Dark, Slippery Rope Ladders, Light-Up-Lift Tower, and Rising Piranhas. They reappear in the New Super Luigi U levels in New Super Mario Bros. U Deluxe.

Super Mario Maker / Super Mario Maker for Nintendo 3DS
They can appear in Super Mario Maker and Super Mario Maker for Nintendo 3DS if the player enlarges a Fire Piranha Plant with a Super Mushroom. It is the first game where Big Venus Fire Traps can appear in Warp Pipes.

Mario & Luigi: Bowser's Inside Story / Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey
Big Venus Fire Traps also appear in Mario & Luigi: Bowser's Inside Story, where they temporarily prevent Bowser from passing in Princess Peach's Castle.

Other appearances
In Super Smash Bros. Ultimate, they are mentioned briefly (where they are called Big Fire Piranhas) by Viridi during Palutena's Guidance dialogue for Piranha Plant.

Trivia

 * Big Venus Fire Traps were meant to appear in the original New Super Mario Bros. and appear fully-functioning in the game's coding, but were not implemented in the final game.