What is the strong nesting preference for the Common Redstart?
Answer
Pre-existing cavities or crevices in old trees or buildings
Common Redstarts strongly favor pre-existing cavities or crevices found in old trees, stone walls, or provided bird boxes for nesting.

Related Questions
What primary factor separates the American Redstart from the Common Redstart despite sharing a common English name element?Which colors primarily distinguish the striking male American Redstart?What is characteristic of the Common Redstart male's coloration?What distinguishing color do female American Redstarts display where males show orange or red?Where does the Common Redstart primarily spend its non-breeding season?What is the noted foraging technique of the American Redstart involving its plumage?What is the strong nesting preference for the Common Redstart?What feature inspired the common English name element "redstart" for both species?How many eggs does the American Redstart typically lay?Which measurement primarily characterizes the size of the American Redstart?