U.S. biologists study animal migration

For the past year, scientists at the Smithsonian Conservation Biology Institute have been working with aviation and aerospace leaders, led by Airbus to launch the “Partners in the Sky” program using aviation and aerospace technology to create a first-of-its-kind global animal-tracking system.

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Migrating monarch butterflies straggle into Mexico

Last year’s low of 60 million now seems great compared with the fewer than 3 million that have shown up this year. Some experts fear that the spectacular migration could be near collapse.