I'm the part of the bird that's not in the sky. I can swim in the ocean and yet remain dry. What am I?

Wet and muggy With rare frogs and buggy Land that's both temperate and tropical When it comes to the world's climate, it's topical.

Pocked and marked, Torn and hewn, As the surface, Of the moon

I'm called the Houdini of the ocean, Slipping away is my daily devotion. With eight arms and a clever disguise, I vanish before you can realize.

I'm a flying cliche, and I'm sick of it. I don't always sit on a pirate's shoulder, asking for crackers and my name's not always Polly!