Answer:
Tall when seated, short when standing.
I can change color to match my surroundings and I can move my eyes in different directions at the same time. What am I?
This noble creature has the embarrassing inability to get up once it's been flipped onto its back.
From that which comes within itself, It builds its table on my shelf.
It is a big and bulky mammal, And has a trunk just like a tree. Will store water in its nose, Which is long and like a hose.
I love spinach.