▁pel ican , ▁Pe le can us ▁on oc rot alus ▁P ink - back ed ▁pel ican , ▁Pe le can us ▁r uf esc ens ▁( A ) ▁Dal mat ian ▁pel ican , ▁Pe le can us ▁cr isp us ▁ ▁Bit tern s , ▁her ons , ▁and ▁e gre ts ▁Order : ▁Pe le can iformes Family : ▁Ar de idae ▁ ▁The ▁family ▁Ar de idae ▁contains ▁the ▁her ons , ▁e gre ts ▁and ▁bit tern s . ▁Her ons ▁and ▁e gre ts ▁are ▁w ading ▁birds ▁with ▁long ▁ne cks ▁and ▁legs . ▁Her ons ▁are ▁large ▁and ▁e gre ts ▁are ▁smaller . ▁The ▁cattle ▁eg ret ▁or ▁" cow ▁bird " ▁is ▁seen ▁amongst ▁f lock s ▁of ▁cattle , ▁for ▁instance ▁in ▁ran ches ▁north ▁of ▁the ▁Ever gl ades . ▁A ▁bird ▁will ▁often ▁attach ▁itself ▁to ▁a ▁particular ▁b ull , ▁cow ▁or ▁cal f , ▁even ▁being ▁toler ated ▁per ch ing ▁on ▁the ▁back ▁or ▁even ▁the ▁head ▁of ▁the ▁animal . ▁The ▁birds ▁are ▁more ▁sh y ▁than ▁the ▁animals , ▁and ▁will ▁fly ▁away ▁if ▁approached . ▁The ▁birds ▁feed ▁on ▁various ▁items ▁turned ▁over ▁by ▁the ▁cattle ▁as ▁they ▁gra ze ▁and ▁tr amp ▁the ▁ground . ▁Bit tern s ▁tend ▁to ▁be ▁shorter ▁neck ed ▁and ▁more ▁secret ive . ▁Un like ▁other ▁long - ne ck ed ▁birds ▁such ▁as ▁st ork s , ▁i b ises ▁and ▁sp oon b ills