Mermaid.

Come on, let's go down to the river where the water flows. Then into the trees, where the caterpillars hide on the underside of the leaves. You can whistle with the birds as I run away screaming, into fields with butterfly wings catching the sunlight, gleaming. I'll grab a stick and draw you a picture. You can laugh at me as I start to vanish. Beneath the water's surface I'll swim deeper and deeper. I'll grow gills and you'll grow impatient. Over the waterfall I'll have went by the time you've given up searching. I'll send you a letter from Atlantis, tied to a gulls leg. Oh leg, legs! My legs are now one, a giant fishes tail. I am one with the sea, will you sail? Sail the great ocean to one day find me?