The critically endangered monarch butterfly grew its presence in Mexico last year, a study showed on Tuesday, giving a glimmer of hope to researchers who track the fluttering orange and black migrants despite a decades-long population collapse.
In one of planet's most epic wildlife migrations, the slow-moving monarch butterflies travel south as many as 2,800 miles from spots in Canada and the United States to hunker down for the winter in warmer Mexico, where millions cover entire trees that tourists flock to see.
But that compares to nearly 45 acres of Mexican forest covered with monarch butterflies in the mid-1990s.
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