The researchers looked at several possible causes of the declines - including global warming, ultraviolet radiation, pesticide use and habitat destruction due to urbanization and agriculture - and concluded that both urbanization and pesticides may be important factors in the declines.
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looked concluded may be
at several possible causes of the declines - including global warming, ultraviolet radiation, pesticide use and habitat destruction due to urbanization and agriculture -
that both urbanization and pesticides may be important factors in the declines
important factors in the declines