Surveys have shown that the numbers of the impressively migratory (Canada to Mexico) Monarch butterfly in the coastal region of California have declined from 4.5 million in the 1980s to around 29k in current times (https://www.theguardian.com/environment/2020/jan/22/monarch-butterfly-population-decline-california-coast). This means that their numbers have declined to less than 1% of their earlier total in only 40 years. Most of the decline has been linked to habitat loss but climate change might well play a role.
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