). ▁Hand book ▁of ▁North ▁American ▁birds , ▁Vol . ▁ 2 : ▁Water f ow l . ▁P t . ▁ 1 . ▁Y ale ▁Un iv . ▁Press , ▁New ▁H aven , ▁CT . ▁M ales ▁usually ▁attempt ▁to ▁draw ▁attention ▁of ▁approaching ▁pred ators ▁and ▁to ll ▁( m ob ▁terrest rial ▁pred ators ▁without ▁physical ▁contact ) ▁often ▁in ▁accompan iment ▁with ▁males ▁of ▁other ▁go ose ▁species . ▁E ag les ▁of ▁both ▁species ▁frequently ▁cause ▁ge ese ▁to ▁fly ▁off ▁en ▁mas se ▁from ▁some ▁distance , ▁though ▁in ▁other ▁instances , ▁ge ese ▁may ▁seem ▁un con c ern ed ▁at ▁per ched ▁bald ▁e ag les ▁nearby , ▁seem ingly ▁only ▁react ing ▁if ▁the ▁e agle ▁is ▁displaying ▁active ▁hunting ▁behavior . ▁Canada ▁ge ese ▁are ▁quite ▁w ary ▁of ▁humans ▁where ▁they ▁are ▁regularly ▁h unted ▁and ▁killed , ▁but ▁can ▁otherwise ▁become ▁hab itu ated ▁to ▁fear less ness ▁towards ▁humans , ▁especially ▁where ▁they ▁are ▁fed ▁by ▁them . ▁This ▁often ▁leads ▁to ▁the ▁ge ese ▁becoming ▁over ly ▁ag gress ive ▁towards ▁humans , ▁and ▁large ▁groups ▁of ▁the ▁birds ▁may ▁be ▁considered ▁a ▁n uis ance ▁if ▁they ▁are ▁causing ▁persistent ▁issues ▁to ▁humans ▁and ▁other ▁animals ▁in ▁the ▁surrounding ▁area . ▁ ▁Sal inity ▁Sal inity ▁plays ▁a ▁role ▁in ▁the ▁growth ▁and ▁development ▁of ▁g os lings . ▁Mod er ate ▁to ▁high ▁sal inity ▁concentr ations ▁without ▁fresh ▁water ▁results ▁in ▁slower ▁development , ▁growth