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Combined Count Data Reveals Shifts in Hawks’ Migratory Behavior


Bird species’ distributions and migratory behavior are shifting in response to changes in climate and land-use, but surveys that focus on a particular season can cause scientists to miss trends in the bigger picture. A new study from The Condor: Ornithological Applications tackles this problem by combining Red-tailed Hawk counts from both migration and winter, and finds that while the hawks’ numbers are stable overall, their migratory behavior is undergoing a change. Read the press release at https://americanornithologypubsblog.org/2017/02/08/combined-count-data-reveals-shifts-in-hawks-migratory-behavior/.



Allen’s Hummingbird Boom Missed by Breeding Bird Surveys


Allen’s Hummingbird has been placed on several conservation watchlists, as breeding bird surveys indicating population declines have spurred concerns that climate change may push it out of Southern California. However, local birdwatchers have reported at the same time that the non-migratory subspecies of Allen’s Hummingbird, once restricted to the Channel Islands, is now a common sight at feeders in Riverside and Los Angeles. Why the discrepancy? A new commentary published in The Condor: Ornithological Applications may provide answers. Read the press release at https://americanornithologypubsblog.org/2017/02/08/allens-hummingbird-boom-missed-by-breeding-bird-surveys/.



Greater Sage-Grouse More Mobile Than Previously Suspected


Greater Sage-Grouse are thought to return to the same breeding ground, or “lek,” every spring—but how do populations avoid becoming isolated and inbred? A new study from The Condor: Ornithological Applications used thousands of DNA samples collected at leks across four states to reveal that some sage-grouse travel more widely than anyone suspected and, in doing so, may temper inbreeding and isolation. Read the press release at https://americanornithologypubsblog.org/2017/02/08/greater-sage-grouse-more-mobile-than-previously-suspected/.

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