Open your eyes and see,
The world beyond you and me.
It's really a shame that we're so quick to blame,
Before we learn ecology.
This song is about the various niches (roles) organisms have in their environment and how we lable them as "good" or "bad".  It is sung from the perspective of being a scavenger, predator, or weedy plant. Follow up could be to have a list of critters and plants that are considered pests and have kids become that "pest" and explain what their life is about.
Open Your Eyes and See
By E.M. BOSS (C) Bossetunes 2001
Log-a-Rithms*
Jam on the Kitchen Floor