An gano MOR 693 a kusa da Shell, Wyoming, ta hanyar haɗin gwiwar Gidan Tarihi na Rockies da Jami'ar Wyoming Geological Museum. Wannan kwarangwal ne aka gano ta ƙungiyar Switzerland, wanda Kirby Siber ya jagoranta. A shekara ta 1996 wannan ƙungiyar ta gano wani Allosaurus na biyu, "Big Al Two", wanda shine mafi kyawun kwarangwal na irin sa har zuwa yau. Cikakke, kiyayewa, da mahimmancin kimiyya na wannan kwarangwal ya ba "Big Alrum" sunansa; raunin mutum da kansa ya kasance ƙasa da matsakaicin girman Allosaurus fragilis, kuma an kiyasta shi ne kawai 8%. An bayyana samfurin a cikin watanni goma sha tara na rayuwa. Breitha ya mutu a shekara ta 1996.
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