Growing Returns

Selected tag(s): eastern population

Monarch butterfly population down 53% from last year. Here’s the swift action we need.

By / Bio / Twitter profile / Published: March 18, 2020

Last week, scientists released results from the latest count of the eastern monarch butterfly population — the main population that migrates east of the Rockies and overwinters in Mexico. The 53% drop from just last year was an unexpected and staggering outcome that left conservationists like me downcast, but ready to act.

While many of us were expecting to see some small decline, this significant drop is especially alarming because it indicates that the monarch population is below the threshold at which scientists predict the migration could collapse. Read More »

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Are monarch populations up or down? Scientist explains conflicting reports

By / Bio / Published: February 5, 2019

It’s hard to know what to make of the recent monarch butterfly news. On one hand, the western population of monarchs native to California is down 86 percent this year compared to last – reaching a dangerously low threshold that puts them on the brink of extinction. On the other hand, the eastern population that migrates east of the Rockies and overwinters in Mexico is up 144 percent – the highest count since 2006.

With the U.S. Fish and Wildlife Service currently weighing the need to list monarch butterflies as threatened or endangered, the stakes are incredibly high to understand what these population trends mean for the iconic species.

So how do scientists explain these apparently conflicting population numbers?

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