What am I?

I am brown and sticky. What am I?

I have four wings, but cannot fly, I never laugh and never cry; on the same spot I'm always found, toiling away with little sound. What am I?

I eat as you turn me, my blade cutting wood. When I am full, empty me you should. What am I?

I start out the same as others, Then grow to four legs and four arms, And two hearts beat inside, Until the separation. What am I?

Riddles and Answers