A - 1 A , ▁ 2 – 3 , ▁and ▁ 3 B , ▁ 3 A , ▁and ▁ 4 . ▁ ▁Leg ▁gauge ▁▁ ▁The ▁band ▁size ▁is ▁determined ▁by ▁using ▁the ▁leg ▁gauge . ▁A ▁leg ▁gauge ▁is ▁placed ▁around ▁the ▁bird ' s ▁leg ▁which ▁determ ines ▁the ▁circum ference ▁of ▁the ▁leg . ▁After ▁ident ifying ▁the ▁size ▁of ▁a ▁band ▁it ▁is ▁then ▁placed ▁on ▁around ▁the ▁leg ▁with ▁the ▁help ▁from ▁the ▁band ing ▁p liers . ▁Most ▁water f ow l ▁are ▁leg ▁band ed , ▁while ▁occasionally ▁some ▁water f ow l ▁are ▁band ed ▁via ▁neck ▁col lar . ▁In ▁Australia , ▁band ▁size ▁range ▁from ▁ 1 ▁to ▁ 1 5 , ▁plus ▁special ▁sizes ▁for ▁birds ▁whose ▁leg ▁shapes ▁require ▁special ▁bands , ▁such ▁as ▁par ro ts ▁and ▁pel icans . ▁ ▁Wing ▁r uler ▁▁ ▁When ▁looking ▁through ▁the ▁P yle ▁text book ▁some ▁birds ▁can ▁be ▁identified ▁by ▁the ▁wing ▁cord . ▁The ▁next ▁essential ▁piece ▁of ▁equipment ▁is ▁the ▁wing ▁r uler , ▁which ▁is ▁used ▁to ▁determine ▁the ▁length ▁of ▁the ▁wing ▁for ▁data ▁collection , ▁research ▁purposes , ▁or ▁determ ining ▁species . ▁ ▁Digital ▁scale ▁▁ ▁Once ▁the ▁processing ▁of ▁the ▁bird ' s ▁morph ology ▁has ▁been ▁completed ▁the ▁last ▁piece ▁of ▁equipment ▁used ▁is ▁a ▁digital ▁scale . ▁This ▁helps ▁with ▁determ ining ▁the ▁weight ▁of ▁the ▁bird . ▁This ▁is ▁the ▁last ▁step ▁before ▁re le asing ▁the ▁bird .