Real life examples:
The wasps and the fig tree - Fledermausblumen/Blumenfledermäuse
In nature you can find examples of cooperation, too. The fig tree and wasps
cooperate. If the wasps don't dust the fig tree, the fig tree will die. The
fig tree is the hiding place for the wasps, where they put their eggs in.
If the wasps don't have a hiding place, they will die.
And people have learned about Fledermausblumen and Blumenfledermäuse
because cooperation in Biology/nature is important.