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  Sierra Magazine
  November/December 2008
Table of Contents
 
  COLD SWEAT:
Ice Manliness Cometh
A Six-Dog-Power Engine
I (Heart) Snowshoeing
Skiing Yellowstone
Freeze-Frame
 
  MORE FEATURES:
Welcome Back to the World
Rotten Fish Tales
Big Fun in the Green Zone
 
  DEPARTMENTS:
Spout
Create
Enjoy
Hey Mr. Green
Smile
Act
Explore
Grapple
Comfort Zone
Mixed Media
Bulletin
Last Words
 
  MORE:
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Lay of the Land

Three Strikes, You're Hired | Ten Reasons to Oppose "Fast Track" | No Net Loss? No Comment | Spreading Their Wings | Costly Corn | Deadly Winter for Monarchs | It Pays to be Popular | Honor Thy Father | Sprawl | WWatch | Bold Strokes | Updates

Deadly winter for monarchs

A new plan to protect monarch butterfly habitat from logging couldn't save the regal insects from inclement weather. In January, a severe rainstorm and freezing temperatures killed as many as 250 million monarchs in the mountains of central Mexico, perhaps 80 percent of the U.S. and Canadian butterflies breeding there. (Based on this death toll, scientists are revising their previous population estimates of 100 million monarchs wintering in Mexico.) The World Wildlife Fund suspects that illegal deforestation may have played a role in the largest known monarch die-off: As the forest canopy thins, it retains less heat and provides less cover against the potentially deadly elements. (See "Lay of the Land," March/April 2002.)

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