Fewest Monarch butterflies migrating

Jan 29, 2014, 5:15 PM EST
One of the 185 Monarch butterflies symbolizing the 185 people who lost their lives in the February the 22nd earthquake is seen after its release by Christchurch youths at a remembrance service in Hagley Park in Christchurch on February 22, 2012 one year after a 6.3 quake hit New Zealand's second largest city.
MARTY MELVILLE/AFP/Getty Images

The migration of Monarch butterflies to mountains in Mexico has been tracked every year since 1993, and this year has shown the fewest number of colonies. The migratory phenomenon is in danger of disappearing. Herbicides are partially to blame.

Background:

Migrating Monarch Butterflies in "Grave Danger," Hit New Low [National Geographic]

Monarch Butterflies Falter Under Extreme Weather [New York Times]

 

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