Caterpillar is based on the arcade hit Centipede. This version, although with very rudimentary sound effects (basically, the equivalent of the SOUND command), does feature all of the play elements of the original arcade game, including the scorpion and poison mushrooms. And, like a lot of Dave's games, if you dump the .BIN file, you will see hidden messages in the code. In Caterpillar's case, check offsets $690-$6af in the .BIN file.
Title: Caterpillar
Author: Dave Edson
Publisher: Aadvark-80
Released: November 1982
Requires: Color Computer 1,2,3, 16K RAM, tape or disk, joystick.