Mollusk Whistle

The Mollusk Whistle is a mount-summoning item that summons a rideable Flamingo mount that travels. It is purchased by the Zoologist for after the world has 25% of the Bestiary unlocked (130 entries out of 520).

This mount allows players to float in water, similar to using an Inner Tube, and dive by holding. The mount bobs to the surface when the down key is released, and if deep enough, the player will launch out of the water into the air high enough in small worlds for space enemies to spawn, such as Wyverns or harpies. The mount also greatly reduces fall damage.

This mount also raises your height to 4 blocks, instead of 3.

Trivia

 * The tooltip is a portmanteau of the words "flamingo" and "go", repeated multiple times to form a command.