▁his ▁ideas ▁in ▁a ▁l ively ▁fashion . ▁Indeed , ▁Bak ker ' s ▁illustr ation ▁of ▁De in ony chus , ▁made ▁for ▁Ost rom ' s ▁ 1 9 6 9 ▁description , ▁has ▁become ▁one ▁of ▁the ▁most ▁recogn is able ▁and ▁icon ic ▁of ▁din osa ur ▁rest or ations . ▁ ▁During ▁the ▁ 1 9 7 0 s , ▁rest or ations ▁of ▁din osa urs ▁shift ed ▁from ▁being ▁l izard - like , ▁to ▁being ▁more ▁m amm al - ▁and ▁bird - like . ▁Art ists ▁started ▁to ▁show ▁din osa urs ▁in ▁more ▁active ▁pos es , ▁and ▁incorpor ating ▁newer ▁theories ▁of ▁din osa ur ▁lo com otion ▁and ▁behaviour . ▁T ails ▁that ▁were ▁widely ▁shown ▁as ▁having ▁been ▁drag ged ▁behind ▁a ▁creature , ▁were ▁now ▁shown ▁u pl ift ed , ▁in ▁order ▁to ▁balance ▁the ▁huge ▁bodies ▁while ▁active . ▁ ▁Besides ▁Bak ker , ▁key ▁artists ▁in ▁this ▁" new ▁wave " ▁were ▁first ▁Mark ▁Halle tt , ▁Gregory ▁S . ▁Paul ▁in ▁the ▁ 1 9 7 0 s , ▁and ▁during ▁the ▁ 1 9 8 0 s ▁Doug ▁Hend erson ▁and ▁John ▁G ur che . ▁ ▁Gregory ▁Paul ▁in ▁particular ▁def ended ▁and ▁expanded ▁on ▁Bak ker ' s ▁ideas ▁on ▁din osa ur ▁an atom y . ▁He ▁exp ounded ▁a ▁rig orous ▁and ▁detailed ▁approach ▁to ▁din osa ur ▁rest oration , ▁in ▁which ▁he ▁often ▁critic ised ▁the ▁errors ▁of