: R oman ian ▁military ▁personnel ▁of ▁World ▁War ▁I ▁Category : R oman ian ▁Land ▁Forces ▁officers ▁Category : 2 0 th - century ▁transl ators <0x0A> </s> ▁A vis aur idae ▁is ▁a ▁family ▁of ▁ext inct ▁en anti orn it he an ▁birds ▁from ▁the ▁C ret ace ous ▁period , ▁distinguished ▁by ▁several ▁features ▁of ▁their ▁an k le ▁b ones . ▁Depending ▁on ▁the ▁definition ▁used , ▁A vis aur idae ▁is ▁either ▁a ▁broad ▁and ▁w ides p read ▁group ▁of ▁advanced ▁en anti orn it he ans ▁( follow ing ▁C au ▁& ▁Ar du ini , ▁ 2 0 0 8 ), ▁or ▁a ▁small ▁family ▁within ▁that ▁group , ▁restricted ▁to ▁species ▁from ▁the ▁Late ▁C ret ace ous ▁of ▁North ▁and ▁South ▁America ▁( follow ing ▁Ch ia ppe , ▁ 1 9 9 2 ). ▁ ▁Description ▁ ▁A vis aur ids ▁were ▁among ▁the ▁largest ▁and ▁last ▁en anti orn it he ans ▁to ▁have ▁lived , ▁although ▁they ▁are ▁also ▁among ▁the ▁most ▁poor ly ▁preserved . ▁The ▁majority ▁of ▁them ▁are ▁known ▁primarily ▁from ▁foss il ized ▁t ars omet at ars al ▁b ones , ▁the ▁part ▁of ▁a ▁bird ' s ▁leg ▁formed ▁by ▁f used ▁met at ars als ▁( the ▁b ones ▁which ▁compr ise ▁the ▁foot ▁in ▁humans ). ▁As ▁a ▁result , ▁members ▁of ▁this ▁family ▁are ▁distinguished ▁from ▁other ▁en anti orn it he ans ▁exclus ively ▁by ▁features ▁of ▁the ▁t