Monarch butterflies are making their flight north after wintering in Mexico. Here's what to know about one of Earth's ...

Monarch butterflies are a "canary in the coal mine." They are an indicator of things to come if we don't protect the delicate species.

You can chart the progress ... The smaller western population is found west of the Rockies and overwinters in California. The article Monarch Butterflies Making Their Way To Chicago Area appeared ...

The eastern monarch population is made up the butterflies east of the Rocky Mountains and accounts for roughly 99% of all North American monarchs. They migrate each winter to oyamel fir forests on ...

Data from a recent study she participated in show a decline in monarch butterfly numbers. Oberhauser said 30 years of reliable population data support this species’ trending decline. From this ...

Scientists estimate there needs to be a minimum of 15 acres of butterflies for the species to be out of the danger zone of migratory collapse, but the most recent count documented less than an acre of ...

With a 90% decline in the monarch butterfly population in just the last few decades, Hillsborough Township is doing their part in efforts to essentially “save the monarch butterfly.” ...

World Wildlife Fund Mexico and its partners have reported a doubling of the eastern monarch population. The tally is not made by counting each individual butterfly. Instead, butterfly counters ...