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"The
peregrines don't have many predators, so I think it's probably
something in their environment. Many species, not just birds,
show a population decline due to habitat loss. You might check
if there have been changes in the birds' nesting areas, like
the development of human houses or shopping malls."
"It could also be something in the environment that
is making the birds sick: either a disease, or some kind of
toxic poisoning."
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