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Monarch Population in Mexico

Newborn gray whale baby and mother

Still Dangerously Low
January 27 2015

Although the number of monarchs overwintering in Mexico has increased from last year's record low, the population remains 80% below the historic average. There are 57 million monarchs compared to a long-term average of 300 million and peak of 1 billion. The clustering butterflies cover less than 3 acres of forest compared to a peak of 51 and an average of 15 acres. Half of this year's monarchs are residing in only one of the 12 traditional sites.

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