The relationship between epiphytic orchids and rainforest trees.
* Epiphytic orchids: These orchids grow on the branches of trees, using the tree for support and access to sunlight. They do not harm the tree.
* Rainforest trees: The trees provide a living surface for the orchids, but they are not directly affected by the orchids' presence.
Why this is commensalism:
* One organism benefits (orchid): The orchid benefits from the tree by gaining a place to grow and access to sunlight.
* The other organism is neither harmed nor helped (tree): The tree isn't harmed by the orchid's presence, and it doesn't receive any benefit from it.
Other examples of commensalism in the rainforest:
* Birds nesting in tree cavities: The birds benefit from shelter, but the tree is unaffected.
* Certain insects living on the backs of rainforest mammals: The insects get transportation and access to food, while the mammal is not harmed.
Let me know if you'd like more examples or have other questions!
