▁Orig ins ▁gallery ▁ ▁is ▁designed ▁as ▁a ▁voyage ▁through ▁the ▁tim eline ▁of ▁the ▁cos mos ▁and ▁discuss es ▁major ▁events ▁in ▁the ▁history ▁of ▁planet ▁Earth . ▁ ▁Among ▁the ▁exhib itions ▁is ▁a ▁hands - on ▁Ex pl oration ▁Station ▁and ▁the ▁Pale o ▁Dig ▁Pit . ▁ ▁Three ▁changing ▁exhibition ▁gall eries ▁offer ▁a ▁variety ▁of ▁subjects . ▁The ▁evolution ▁of ▁flight — was ▁it ▁from ▁the ▁ground - up ▁or ▁from ▁the ▁tree ▁down ? ▁ ▁Az M N H ' s ▁exhibition , ▁" R ul ers ▁of ▁the ▁Pre histor ic ▁Sk ies ," ▁helped ▁to ▁answer ▁that ▁question . ▁The ▁exhib it ▁has ▁since ▁been ▁removed , ▁but ▁the ▁p ter osa urs ▁are ▁still ▁visible ▁throughout ▁the ▁museum . ▁ ▁At ▁no ▁other ▁time ▁in ▁the ▁history ▁of ▁life ▁on ▁Earth ▁were ▁there ▁animals ▁like ▁the ▁p ter osa urs , ▁those ▁flying ▁cre atures ▁who ▁truly ▁did ▁rule ▁the ▁sky . ▁They ▁were ▁the ▁first ▁verte br ates ▁to ▁achieve ▁flight , ▁and ▁they ▁did ▁it ▁in ▁a ▁way ▁that ▁was ▁all ▁their ▁own . ▁In ▁addition ▁to ▁very ▁distinct ly ▁sh aped , ▁thin , ▁h ollow ▁b ones , ▁p ter osa urs ▁had ▁memb ran ous ▁wings ▁which ▁were ▁probably ▁flexible ▁and ▁able ▁to ▁change ▁shape ▁during ▁flight . ▁ ▁The ▁actual ▁mechanical ▁details ▁are ▁not ▁completely ▁understood ▁by ▁pale ont olog ists , ▁thus ▁giving ▁rise ▁to ▁multiple ▁opinions . ▁ ▁The ▁main ▁goal ▁of ▁the ▁exhib it ▁was