Answer:
What is the word that even in plain sight remains hidden?
I am not very commonly found! Only in some rainforest! I have an odd number of toes! I'm very lazy and hang upside down!
I am a ship that can be made to ride the greatest waves. I am not built by objects but built by minds.
I am alive without breath and cold as death. I am never thirsty but always drinking.
I am perfect with a head perfect without a head; Perfect with a tail perfect without a tail; Perfect with either neither or both.
A little house full of meat, no door to go in and eat.