Mutualism - Why we all need each other

Olivia Judson in the New York Times writes a fascinating piece on how different species work together in harmony. Examples include the shrimp goby, a small fish that warns the shrimp of any danger in return for shelter.

While one would expect in these relationships to break down with one side turning into a parasite, it appears that the ability to cohabit and share allows both parties to evolve more efficiently.

Something perhaps us humans could learn from...