Monarch butterfly population wintering in Mexico increases 144%
by Associated Press in Mexico City from on (#4842S)
Monarch production will not be replicated next year, experts warn, as above average temperatures will cause problems
The population of monarch butterflies wintering in central Mexico is up 144% over last year, according to new research.
Related: 'It's a sad reality': a troubling trend sees a 97% decline in monarch butterflies
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