Microsoft Rewards Bing Homepage Quiz: This cattle egret benefits from the Burchell’s zebra’s behavior, without harming the zebra. What’s that called?
B Free-lunch theory
As the zebra grazes in the grass, it stirs up insects for the egret to eat. It’s a great example of commensalism, a form of symbiosis in which one species gets a benefit without helping or hurting the other species.
The correct answer is Commensalism.