In 1981 the Xerces Society, a non-profit environmental organization that focuses on the conservation of invertebrates, counted more than 1 million Western Monarchs wintering throughout California.
The group’s most recent count, over Thanksgiving weekend, estimated 20,500 Western Monarchs in 2018, an 86% decline from the nearly 148,000 spotted the previous year, according to an annual census conducted by the Xerces Society, SFGate reported last Sunday.
Researchers with the conservation group called
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