▁migr ations . ▁Most ▁Canada ▁ge ese ▁have ▁st aging ▁or ▁rest ing ▁areas ▁where ▁they ▁join ▁up ▁with ▁others . ▁Their ▁aut umn ▁migration ▁can ▁be ▁seen ▁from ▁September ▁to ▁the ▁beginning ▁of ▁November . ▁The ▁early ▁migr ants ▁have ▁a ▁t endency ▁to ▁spend ▁less ▁time ▁at ▁rest ▁stops ▁and ▁go ▁through ▁the ▁migration ▁much ▁faster . ▁The ▁later ▁birds ▁usually ▁spend ▁more ▁time ▁at ▁rest ▁stops . ▁Some ▁ge ese ▁return ▁to ▁the ▁same ▁nest ing ▁ground ▁year ▁after ▁year ▁and ▁lay ▁eggs ▁with ▁their ▁mate , ▁raising ▁them ▁in ▁the ▁same ▁way ▁each ▁year . ▁This ▁is ▁recorded ▁from ▁the ▁many ▁tag ged ▁ge ese ▁which ▁frequent ▁the ▁East ▁Coast . ▁ ▁Canada ▁ge ese ▁fly ▁in ▁a ▁distinct ive ▁V - sh aped ▁flight ▁formation , ▁with ▁an ▁alt itude ▁of ▁ 1   km ▁( 3 , 0 0 0 ▁feet ) ▁for ▁migration ▁flight . ▁The ▁maximum ▁flight ▁ce iling ▁of ▁Canada ▁ge ese ▁is ▁unknown , ▁but ▁they ▁have ▁been ▁reported ▁at ▁ 9   km ▁( 2 9 , 0 0 0 ▁feet ). ▁ ▁F lying ▁in ▁the ▁V ▁formation ▁has ▁been ▁the ▁subject ▁of ▁study ▁by ▁research ers . ▁The ▁front ▁position ▁is ▁rot ated ▁since ▁flying ▁in ▁front ▁cons umes ▁the ▁most ▁energy . ▁Canada ▁ge ese ▁leave ▁the ▁winter ▁grounds ▁more ▁quickly ▁than ▁the ▁summer ▁grounds . ▁E lev ated ▁thy roid ▁h orm ones , ▁such ▁as ▁T 3 ▁and ▁T 4 , ▁have ▁been ▁measured ▁in ▁ge ese