Whales are found only in Level 4-2. When Mario, Luigi, Toad, and Princess Peach encounter a Whale, it'll spray water from its blowhole and it hurts them. Mario, Luigi, Toad, and Princess Peach will fall into the water and won't jump on its tail if they're uncareful. Whales act as platforms in the series. When they're on the blowhole, it won't spray water. Some enemies are on Whales, like Shy Guys and Snifits.
Note: Whales can't die from being killed by veggies or go back to the water.
Whale (Paper Mario)
This Whale isn't an enemy character. He's an individual whale in the game. He had Fuzzipede in his mouth and Mario must defeat him and he takes him to Yoshi Village.
The Six Golden Coins
Mario must enter the Whale and fight the Octopus to travel in the end of it.
The Whale in The Super Show made its appearance and it appeared a Blue Whale and only appeared in Mario of the Deep. It's a non-enemy in the episode.
One also made an appearance in the Nintendo Monopoly.