What human intervention during the 1800s is believed to have caused an all-time high in the warbler population?

Answer

Widespread clear-cutting followed by uncontrolled wildfires

Industrial disturbance from European settlers, specifically clear-cutting followed by uncontrolled wildfires in the slash, inadvertently created massive tracts of perfectly aged, young jack pine, coinciding with an all-time high in the population.

What human intervention during the 1800s is believed to have caused an all-time high in the warbler population?

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I Tracked Down the RAREST Warbler in the United States! - YouTube

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