▁black ▁n yl on ▁material ▁and ▁come ▁with ▁ 4 ▁sh el ves ▁to ▁catch ▁the ▁birds ▁once ▁they ▁fly ▁into ▁the ▁net . ▁When ▁purch asing ▁a ▁mist - net ▁for ▁sp arrow s ▁the ▁height ▁usually ▁stays ▁the ▁same ▁at ▁ 2 . 7 ▁meters ▁but ▁var ies ▁in ▁width ▁at ▁ 6 ▁meters ▁to ▁ 1 8 ▁meters ▁at ▁a ▁ 3 0 mm ▁mesh . ▁Det erm ining ▁net ▁size ▁for ▁large ▁sp arrow s ▁to ▁j ays ▁are ▁ 2 . 6 ▁meters ▁high ▁and ▁varying ▁in ▁width s ▁at ▁ 6 ▁meters ▁to ▁ 1 8 ▁meters ▁at ▁a ▁ 3 8 mm ▁mesh . ▁ ▁If ▁the ▁study ▁requires ▁the ▁band ing ▁of ▁large ▁ow ls ▁a ▁specific ▁net ▁is ▁required ▁and ▁it ▁is ▁made ▁with ▁a ▁heav ier ▁material ▁to ▁with stand ▁the ▁tal ons ▁of ▁the ▁ow l ▁at ▁ 6 0 mm ▁mesh . ▁Band ing ▁ha w ks ▁also ▁requires ▁a ▁heav ier ▁material ▁at ▁ 1 0 0 mm ▁or ▁ 1 2 7 mm ▁mesh . ▁However , ▁some ▁n ets ▁for ▁larger ▁birds ▁include ▁an ▁additional ▁sh elve ▁at ▁ 5 ▁instead ▁of ▁ 4 . ▁ ▁Band ing ▁p liers ▁▁ ▁Band ing ▁p liers ▁are ▁an ▁essential ▁tool ▁that ▁helps ▁place ▁the ▁band ▁around ▁a ▁bird ' s ▁leg . ▁These ▁p liers ▁come ▁in ▁different ▁sizes ▁as ▁determined ▁by ▁how ▁wide ▁a ▁bird ' s ▁leg ▁is . ▁P liers ▁are ▁s ized ▁between ▁ 0