
A stable ecosystem needs all forms of life to benefit other life forms. When two living things mutually benefit each other, we call it symbiosis. A simple example I see from my window is squirrels gathering acorns that make up a large percentage of their diet. The squirrels bury acorns in various places around the neighborhood and either forget where they buried them or don’t need all the acorns they buried. The result is that oak trees are planted all over the neighborhood. If there were no acorns, the squirrels would starve. If squirrels didn’t plant the acorns over a wide area, the oak trees would be crowded and unable to grow successfully. Squirrels and oak trees are one example of symbiotic relationships.
In the insect world, there are many symbiotic relationships, and some insects have multiple such relationships. The red wood ant is an example. The ants have a symbiotic relationship with aphids, which excrete energy-rich honeydew, which supplies food for the ants. In return, the ants protect the aphids from their enemies.
Another symbiotic relationship is with Eurasian jays. The birds land on an ant mound and allow the ants to crawl on them, spraying their feathers with formic acid. The acid is low enough concentration that it doesn’t harm the birds but is strong enough to kill parasites, including mites, that hide in their feathers. In this way, the jays find protection from mites.
A third symbiotic relationship of red wood ants protects spruce forests by controlling the wood-boring beetles that destroy them. The ants bite the beetles and spray formic acid into their wounds. Killing the beetles protects the spruce trees and provides a home for the aphids that live in them. That takes us back to the ant-aphid symbiosis.
The multiple symbiotic relationships of red wood ants remind us that removing one species may affect many symbiotic relationships. Symbiotic relationships show design. Proverbs 6:6-8 tells us, “Go to the ant, you slacker! Observe its ways and become wise. Without leader, administrator, or ruler, it prepares its provisions in summer; it gathers its food during harvest.”
— John N. Clayton © 2025
Reference: The February 2025 issue of National Geographic magazine (pages 110-132) or nationalgeographic.com