In the film A Bug's Life what was one of Flick's inventions?

Flik shows a total of 4 inventions during the movie. Though they don't have names, they are basically this:

1) A machine [in which you wear on your back] which cuts down an entire stock of grain and places them neatly into a sack in the back of it.

2) A telescope made from a blade of grass and a drop of dew.

3) A megaphone made from a blade of grass and part of a stick.

4) A homemade bird that you can operate from the inside, made to scare Hopper and his gang away.