▁body ▁size , ▁although ▁their ▁relationship ▁is ▁unclear . ▁Our an osa urus ▁is ▁a ▁similar ▁size ▁to ▁more ▁bas al ▁Ten ont osa urus ▁which ▁has ▁slow ▁growth , ▁so ▁either ▁faster ▁growth ▁is ▁caused ▁by ▁body ▁size ▁or ▁Ten ont osa urus ▁is ▁the ▁maximum ▁size ▁of ▁an ▁orn ith op od ▁with ▁a ▁slow ▁growth ▁rate . ▁ ▁Pale o ec ology ▁ ▁Our an osa urus ▁is ▁known ▁from ▁the ▁El rh az ▁Form ation ▁of ▁the ▁T eg ama ▁Group ▁in ▁an ▁area ▁called ▁G ad ou fa ou a , ▁located ▁in ▁Niger . ▁Only ▁two ▁mostly ▁complete ▁ske let ons ▁and ▁up ▁to ▁ 3 ▁additional ▁individuals ▁have ▁been ▁found . ▁The ▁El rh az ▁Form ation ▁consists ▁mainly ▁of ▁fl uv ial ▁sand st ones ▁with ▁low ▁relief , ▁much ▁of ▁which ▁is ▁obsc ured ▁by ▁sand ▁d unes . ▁The ▁sed iments ▁are ▁co arse - ▁to ▁medium - gra ined , ▁with ▁almost ▁no ▁fine - gra ined ▁hor iz ons . ▁Our an osa urus ▁is ▁from ▁the ▁upper ▁portion ▁of ▁the ▁formation , ▁probably ▁A pt ian ▁in ▁age . ▁It ▁likely ▁lived ▁in ▁habit ats ▁domin ated ▁by ▁in land ▁flo od pla ins ▁( a ▁rip arian ▁zone ). ▁ ▁After ▁the ▁ igu an od ont ian ▁L urd us aur us , ▁N ig ers aur us ▁was ▁the ▁most ▁numerous ▁meg ah erb iv ore . ▁Other ▁her b iv ores ▁from ▁the ▁same ▁formation ▁include