2 4 4 ▁are ▁Mig rat ory . ▁About ▁ 1 0 0 ▁species ▁of ▁mig rat ory ▁birds ▁regularly ▁or ▁occasionally ▁visit ▁the ▁country . ▁Consider ing ▁the ▁present ▁thre ats ▁to ▁water bird ▁conservation ▁in ▁the ▁country , ▁ 3 1 ▁mig rat ory ▁water bird ▁species ▁are ▁of ▁high ▁priority ▁for ▁future ▁action ▁for ▁conservation . ▁ 1 4 ▁of ▁these ▁species ▁are ▁threatened . ▁ ▁The ▁wet lands ▁are ▁home ▁to ▁about ▁ 7 0 ▁species ▁of ▁resident ▁water bird s ▁including ▁du cks , ▁gre be , ▁c orm or ants , ▁bit tern s , ▁her ons , ▁e gre ts , ▁st ork s , ▁rails , ▁j ac anas , ▁fin foot , ▁w aders , ▁g ull s , ▁turns ▁and ▁sk imm ers . ▁Ele ven ▁species ▁of ▁resident ▁water bird s ▁are ▁identified ▁as ▁threatened . ▁The ▁important ▁threatened ▁species ▁are ▁mask ed ▁fin foot , ▁Indian ▁sk immer , ▁black - head ed ▁i bis , ▁greater ▁adj ut ant , ▁less er ▁adj ut ant , ▁Ba ikal ▁te al , ▁Ba er ' s ▁po ch ard , ▁fer ru gin ous ▁po ch ard , ▁wood ▁sni pe , ▁Nord mann ' s ▁gre ens h ank ▁and ▁sp oon - bil led ▁sand pi per . ▁▁▁ ▁The ▁wet lands ▁of ▁Bang l adesh ▁are ▁being ▁de grad ed ▁rapidly ▁due ▁to ▁population ▁pressure , ▁withdraw al ▁of ▁water ▁for ▁ir rig ation , ▁destruction ▁of ▁sw