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Thanks to a historic U.S.-Mexico binational agreement, water flowing this year is providing hope for the future of a key ecosystem.
In the early 1900s it wasn't unusual for men to suddenly go missing. Among them were two accomplished bird experts whose lives turned out to be surprisingly intertwined.
When hawks and falcons stream across the sky in large numbers, you need a distinct set of birding skills to tell them apart.
Photographer Tim Flach's new book invites us to marvel at the sheer diversity of avian species.