▁are ▁immediately ▁capable ▁of ▁walking , ▁sw imming , ▁and ▁finding ▁their ▁own ▁food ▁( a ▁di et ▁similar ▁to ▁the ▁adult ▁ge ese ). ▁Par ents ▁are ▁often ▁seen ▁leading ▁their ▁g os lings ▁in ▁a ▁line , ▁usually ▁with ▁one ▁adult ▁at ▁the ▁front , ▁and ▁the ▁other ▁at ▁the ▁back . ▁While ▁protect ing ▁their ▁g os lings , ▁parents ▁often ▁viol ently ▁ch ase ▁away ▁nearby ▁cre atures , ▁from ▁small ▁black bird s ▁to ▁l one ▁humans ▁who ▁approach , ▁after ▁warning ▁them ▁by ▁giving ▁off ▁a ▁his sing ▁sound ▁and ▁then ▁attack ▁with ▁bit es ▁and ▁sla ps ▁of ▁the ▁wings ▁if ▁the ▁threat ▁does ▁not ▁retre at ▁or ▁has ▁seized ▁a ▁g os ling . ▁Canada ▁ge ese ▁are ▁especially ▁protect ive ▁animals , ▁and ▁will ▁sometimes ▁attack ▁any ▁animal ▁near ing ▁its ▁territory ▁or ▁off spring , ▁including ▁humans . ▁Most ▁of ▁the ▁species ▁that ▁pre y ▁on ▁eggs ▁also ▁take ▁a ▁g os ling . ▁Although ▁parents ▁are ▁host ile ▁to ▁un famil iar ▁ge ese , ▁they ▁may ▁form ▁groups ▁of ▁a ▁number ▁of ▁g os lings ▁and ▁a ▁few ▁adult s , ▁called ▁cr è ches . ▁ ▁The ▁off spring ▁enter ▁the ▁fled g ling ▁stage ▁any ▁time ▁from ▁ 6 ▁to ▁ 9 ▁weeks ▁of ▁age . ▁They ▁do ▁not ▁leave ▁their ▁parents ▁until ▁after ▁the ▁spring ▁migration , ▁when ▁they ▁return ▁to ▁their ▁birth place . ▁ ▁M igration ▁ ▁Canada ▁ge ese ▁are ▁known ▁for ▁their ▁season al