Male bowerbirds construct elaborately decorated nests, or bowers. Basing their judgment on the fact that different local populations of bowerbirds of the same species build bowers that exhibit different building and decorative styles, researchers have concluded that the bowerbirds' building styles are a culturally acquired, rather than a genetically transmitted, trait. Which of the following, if true, would most strengthen the conclusion drawn by the researchers?
- There are more common characteristics than there are differences among the bowerbuilding styles of the local bowerbird population that has been studied most extensively.
- Young male bowerbirds are inept at bowerbuilding and apparently spend years watching their elders before becoming accomplished in the local bower style.
- The bowers of one species of bowerbird lack the towers and ornamentation characteristic of the bowers of most other species of bowerbird.
- It is well known that the song dialects of some songbirds are learned rather than transmitted genetically.
Explanation
Answer: Young male bowerbirds are inept at bowerbuilding and apparently spend years watching their elders before becoming accomplished in the local bower style.
The researchers' conclusion: bower-building style is culturally acquired not genetic, based on different styles in different local populations.
To strengthen "culturally acquired," we need evidence of learning from others.
Last verified on 11-07-2026
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