While
overall habitat loss is a factor in these declines, research also indicates that even fields
of sufficient size, if they are fragmented or interrupted by hedgerows or natural windbreaks, will be passed over by the birds, which may view the linear plantings as cover for predators.
In fact, in a 2013 National Geographic article, Ken Rosenberg, director
of conservation science at the Cornell Laboratory
of Ornithology, says that «the top three threats to birds
overall are
habitat loss,
habitat loss, and
habitat loss.»