▁ ▁Th res ki orn ith idae ▁is ▁a ▁family ▁of ▁large ▁terrest rial ▁and ▁w ading ▁birds ▁which ▁includes ▁the ▁i b ises ▁and ▁sp oon b ills . ▁They ▁have ▁long , ▁broad ▁wings ▁with ▁ 1 1 ▁primary ▁and ▁about ▁ 2 0 ▁secondary ▁fe athers . ▁They ▁are ▁strong ▁f liers ▁and ▁despite ▁their ▁size ▁and ▁weight , ▁very ▁capable ▁so ar ers . ▁ ▁G loss y ▁i bis , ▁P leg ad is ▁fal cin ell us ▁E uras ian ▁sp oon b ill , ▁Pl ata lea ▁le uc or odia ▁ ▁D uck s , ▁ge ese , ▁and ▁sw ans ▁Order : ▁An ser iformes Family : ▁An at idae ▁ ▁An at idae ▁includes ▁the ▁du cks ▁and ▁most ▁du ck - like ▁water f ow l , ▁such ▁as ▁ge ese ▁and ▁sw ans . ▁These ▁birds ▁are ▁adapted ▁to ▁an ▁aqu atic ▁existence ▁with ▁we bb ed ▁feet , ▁fl atten ed ▁b ills , ▁and ▁fe athers ▁that ▁are ▁excellent ▁at ▁shed ding ▁water ▁due ▁to ▁an ▁o ily ▁co ating . ▁ ▁M ute ▁sw an , ▁C yg n us ▁o lor ▁( A ) ▁Common ▁sh el du ck , ▁T ador na ▁t ador na ▁Rud dy ▁sh el du ck , ▁T ador na ▁fer rug inea ▁Gre ater ▁white - front ed ▁go ose , ▁An ser ▁alb if rons ▁Gre yl ag ▁go ose , ▁An ser ▁an ser ▁E uras ian ▁w