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Monarch Population in Mexico

Newborn gray whale baby and mother

Record Low
January 29 2014

The number of monarchs overwintering in Mexico has plunged to a new low, with only 1.65 acres of forest covered with clustering butterflies. This record low compares to a peak of 51.8 acres recorded in 1996. At 20 million butterflies per acre, this year's population is estimated at 33 million monarchs compared to the peak of 1 billion in 1996.

 
Monarch butterfly population in Mexico: Chart How many millions of monarch butterflies in Mexico? Monarch butterfly population in Mexico: Chart
Image: Journey North
Historic Records
Image: Elizabeth Howard
How Many Millions?
Image: Journey North
Prediction for this Year?
Estimating the area of monarch butterfly winter colonies in Mexico Estimating the area of monarch butterfly winter colonies in Mexico Estimating the number of monarch butterflies winter colonies in Mexico
Image: Dr. Lincoln Brower
Estimating Area
Image: Wikipedia
How Many Football Fields?
Image: Dave Kust
Estimating Numbers
Map of monarch butterfly sanctuaries in Mexico. Monarch butterfly colony site selection in Mexico Monarch butterfly colony site selection in Mexico
Image: Journey North
The Twelve Sanctuaries
Image: Journey North
Evenly Distributed?
Image: Journey North
Same Each Year?
 
Monarch butterfly migration map

Population Decline
Monarch numbers are down and people are wondering why. This article examines the factors that caused the decline during the past year and the downward trend over the past decade. Also, see how you can help.

 

 

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