I roto i te 1991 "Big Al" (MOR 693), i kitea he 95% oti, tauira āpitihanga o Allosaurus. whanganga te reira e pā ana ki 8 mita (e pā ana ki 26 ft) i roto i te roa. i whakaahuatia MOR 693 tata Shell, Wyoming, i te tahi Museum o te Rockies me University o Wyoming Geological Museum rōpū. i kitea tenei kopu e te rōpū Swiss, arahina e Kirby Siber. i roto i te 1996 kitea te taua rōpū i te tuarua Allosaurus, "Big Al Two", i te mea te pai i tiakina kopu o tona ahua ki te rā. te oti, te tiaki, me te hiranga pūtaiao o tenei kopu i hoatu "Big Alrum" tona ingoa; i raro i te rahi toharite mo Allosaurus fragilis, a i whakaarohia he subad estimated i 8 anake marama. mate te tauira i roto i te 1996 i te Breupthalia. i whakaatu tohu maha o ona wheua i roto i te kopu, i arahihia ranei i te rōpū Swiss, arahina e Kirby Siber. i roto i te 1996 i kitea te
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