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ADVANCE FOR MONDAY MARCH 13, 2017-Karl Berg, an assistant professor of ornithology at the University of Texas Rio Grande Valley, poses for a photograph during a Tuesday, Feb. 21, 2017, tour of natural and artificial nesting habitats of local parrots at the Brownsville, Texas campus.  (Jason Hoekema /The Brownsville Herald via AP)

ADVANCE FOR MONDAY MARCH 13, 2017-Karl Berg, an assistant professor of ornithology at the University of Texas Rio Grande Valley, poses for a photograph during a Tuesday, Feb. 21, 2017, tour of natural and artificial nesting habitats of local parrots at the Brownsville, Texas campus. (Jason Hoekema /The Brownsville Herald via AP)

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