▁Ha ț eg ▁area ▁span ▁over ▁ 3 0 0 ▁million ▁years ▁of ▁Earth ' s ▁ge olog ic ▁history , ▁showing ▁tropical ▁cor al ▁re ef s ▁and ▁vol can ic ▁island ▁in ▁the ▁T eth ys ▁Sea , ▁din osa urs , ▁primitive ▁m amm als , ▁birds , ▁and ▁flying ▁re pt iles ▁( such ▁as ▁H atz eg opter y x , ▁which ▁was ▁named ▁for ▁the ▁region ). ▁ ▁Ha ț eg ▁Island ▁was ▁an ▁island ▁during ▁the ▁C ret ace ous ▁Period ▁where ▁a ▁d war f ▁species ▁of ▁sau rop od ▁din osa ur , ▁Magyar osa urus ▁d ac us , ▁lived ▁until ▁their ▁ext inction ▁at ▁the ▁end ▁of ▁the ▁C ret ace ous . ▁Baron ▁Franz ▁N op cs a ▁published ▁articles ▁about ▁these ▁Mes oz o ic - era ▁arch osa urs ▁on ▁Ha ț eg ▁Island . ▁ ▁His ▁studies ▁led ▁to ▁his ▁theory ▁of ▁ins ular ▁d war f ism , ▁the ▁notion ▁that ▁" limited ▁resources " ▁on ▁small ▁islands ▁can ▁lead ▁to ▁a ▁down - s izing ▁of ▁the ▁ind igen ous ▁verte br ate ▁animals . ▁ ▁Dem ograph ics ▁ ▁N atives ▁▁ ▁Ch ike ▁O ny e je k we ▁ ▁N ne ka ▁O ny e je k we ▁ ▁Gallery ▁ ▁See ▁also ▁▁ ▁H ateg ▁Country ▁Din osa ur ▁Ge op ark ▁ ▁References ▁ ▁External ▁links ▁▁▁▁▁ ▁Ha ț eg ▁City ▁Hall ▁Official ▁Site ▁▁ ▁Category : T own s ▁in