TOLEDO, Ohio (AP) — Nine monarch butterflies released by the Toledo Zoo have been found in central Mexico.
The zoo says the discovery supports its belief that its captive-breeding program works.
Monarch researchers have said mass releases may lead to disease and accelerate the butterfly’s decline. But zoo officials tell The Blade (http://bit.ly/1TS5Cu8 ) newspaper dozens of monarchs released last fall likely survived.
Experts said last month the butterflies have made a big comeback in their Mexico wintering grounds after suffering serious declines.
The area covered by the orange-and-black insects in the mountains west of Mexico City this season was more than three and a half times greater than last winter.
The number of monarchs making the 3,400-mile migration from the United States and Canada steadily declined in recent years before recovering in 2014.
Information from: The Blade, http://www.toledoblade.com/
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