Egret benefits from the Burchell’s zebra’s behavior without harming the zebra. What’s that called?

[5-22-2022] Microsoft Rewards Bing Homepage Quiz Question: This cattle egret benefits from the Burchell’s zebra’s behavior, without harming the zebra. What’s that called?

The given options are:

  • Parasitism
  • Free-lunch theory
  • Commensalism

Correct Answer: Commensalism

Info: Commensalism is a long-term biological interaction (symbiosis) in which members of one species benefit while those of the other species neither benefit nor are harmed. 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.


Today’s “Microsoft Rewards Bing Homepage Quiz” has three questions related to biodiversity. Each question has only one correct answer and carries one point. The wrong answer does not earn any points. So, select only the correct answers.

All three questions from today’s Bing Homepage Quiz are below. You can find their answers by visiting those pages.

  1. This cattle egret benefits from the Burchell’s zebra’s behavior, without harming the zebra. What’s that called?
  2. Which United Nations event is observed on May 22?
  3. Of the millions of plant and animal species on Earth, approximately how many have been identified?

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