Duck Programming
I want to write first about my admiration of ducks, and swans by extension. They are the animals capable of flying (birds), and they also swim. They also walk on land. Ducks, and also swans, are therefore truly all-terrain, all-element animals: they've conquered earth, water and air. (And they're metabolic, living organisms so we'll grant them the command of "fire" in the sense of metabolic oxidation.)
You may be familiar with the saying, "duck typing". The idea is that if something walks like a duck, talks like a duck... then it may be a duck.

