Which one of the following behaviours is a defining attribute for the concept "bird"?

Name: Which one of the following behaviours is a defining attribute for the concept "bird"?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Growing feathers is a defining attribute for the concept "bird," as all birds have feathers. Building nests may be common for many birds, but not all birds do it. Eating insects and vocalizing territorial boundaries are behaviours exhibited by some birds but not all.

Which One of the Following Behaviours Is a Defining Attribute