Answer:
A nut cracker up in a tree.
Turn us on our backs and open up our stomachs you will be the wisest of men though at start a lummox.
When it comes in, From sea to shore, Twenty paces you'll see, No less, no more.
Bright as diamonds, Loud as thunder, Never still, A thing of wonder.
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
I have two eyes in the front and a lot of eyes on my tail
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?