OTTAWAâ€”Itâ€™s a strange day in Ottawa when our Prime Minister Justin Trudeau, U.S. President Barack Obama, and Mexican President Enrique PeÃ±a Nieto chat about butterfly biology and conservation at a press conference. Or perhaps not: monarch butterflies have evolved into a symbol of the North American Free Trade Agreement (NAFTA) and their populations have plummeted. But are monarchs a symbol? Or a symptom? One thing is certain: monarch butterflies are ultra-marathoners. Their annual migration covers a staggering distance
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