You look up at the tree, and over a branch, to an open window.
Jackpot!
Your sister left the window open. All you have to do is climb ...
"How can I climb a tree when I'm so small?" you say to yourself.
And then it hits you. Another squirrel quickly scurries up the tree without grabbing branches or anything. Squirrels can climb trees!
You run over, accidentally stumbling over. Instead of getting up, you keep running, much faster, and more easily at that.
When you're at the base of the tree, you look up. It seems so big now. You always climbed it when you were younger, but this is so different. You stick your newfound paw on the tree, and much to your surprise, it firmly sticks there. With a hopeful leap, you get all four paws on and start to climb upward.
When you get to the branch, you realize how easy it was. It was almost the same as walking, but vertically. As you step onto the branch, your first fear is losing your balance, but no such thing happens. It's like you know how to walk a tight rope.
At the end of the branch, you slowly look down. It is a long drop. If you fell, it would surely be the end of not only your life as a squirrel, but your whole life at that ...