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- monarch caterpillars (larvae)

Here are several representative monarch caterpillars in one photo. The largest one in the center of the photo is about as big as your "pinky" finger.
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- monarchs on tree trunk in Mexico

A remarkable photo of monarch butterflies congregating on the trunk of a tree in their over-wintering grounds in central Mexico.
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- Monarchs in trees, central Mexico

Thousands of monarch butterflies over-winter in a state of suspended animation on the oyamel fir trees in central Mexico about 140 miles west of Mexico City.
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- monarch mortality

Possibly as many as 100 million monarch butterflies died following a storm and several days of subfreezing temperatures in the oyamel fir forests of central Mexico on January 12 - 13, 2002.
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- frozen monarchs

Thousands of monarch butterfly corpses cover the ground in central Mexico after an extreme (cold) weather system passed through their over-wintering site in mid January, 2002.
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- More frozen monarchs

Thousands of frozen monarch butterflies litter the ground in central Mexico after an unusually cold weather system passed through in mid January, 2002.
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