What human activity most directly correlated with the sharp decline in the Kirtland's Warbler population?

Answer

Fire suppression efforts

When fire suppression efforts became widespread throughout the 20th century, the natural cycle that created the perfect young jack pine stands was broken, directly correlating with the sharp decline in the warbler population.

What human activity most directly correlated with the sharp decline in the Kirtland's Warbler population?

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

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