A Bug's Life

There is a clip in which Gary Rydstrom is talking about the sound design for the wings in A Bug's Life. The main thing they worked on was to create the different types of wing flaps and create appropriate sounds for each individual but depending on their personality. As they wanted to portray the bugs through the viewpoint of their world, they couldn't use the sound of real day bugs as these were too small but instead combined sounds together to build up a greater sound. 

For this scene in which the Grass Hoopers enter the Ant Hill they recorded really close up to a Dragonfly, the cracking of uncooked crab and Plastic bendy straw. once combined together these sound built up the bases of the sounds for this scene.  

When Dim flies and rescues the others they wanted to emphasis his size compared to the other as he is so much bigger so used the recording of flapping bubble wrap similarly to the noise of a helicopter, but when he passes they add in the sound of a real Huey Helicopter 

Sourced From Pixar