Answer:
Face with a tree, skin like the sea. A great beast I am. Yet vermin frightens me.
It is more feared than fear itself, And no one can escape it. It takes no sides and does not judge, it does not know to hold a grudge. It is the most clearest result, Of how life beats you by default.
The more you take, the more you leave behind.
A time when they're green. A time when they're brown. But both of these times, cause me to frown. But just in between, for a very short while. They're perfect and yellow. And cause me to smile.
I sleep by day, I fly by night. I have no feathers to aid my flight.
Those with eyes bigger than their stomach will definitely leave the restaurant with one of them. It is named after a house pet as well.