The Mermaid is a quest in Goat MMO Simulator.
The quest is given by Ariel Waterhouse in Goatshire.
Objectives: Bring Miranda the Mermaid to Ariel
Miranda the Mermaid is somewhere in Glarblargle Beach (the exact location seems to be random). Lick her, pop her in your inventory, and run back to Ariel.
You receive pottery in your inventory as a reward.