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Opinion: Logging putting Alberta's southern mountain caribou at risk of extinction

Migration has always fascinated me. Over 30 years ago, I attended a talk on monarch butterfly migration where the scientist spoke of unsolved mysteries of the monarch’s up-to-4,800-kilometre journey across generations, returning to the same mountaintop forests — and sometimes even the same trees — as their ancestors.

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Much of the puzzle has since been solved: Monarchs use a genetically encoded compass combining the sun, circadian clocks in their antennae,........

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