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Trex as a good smeller

I've wondered if really good smellers might be able to smell
directionally--one possible explanation for the slits in the sides of dog
noses, e.g. Directional smelling, like 3-D vision, would make location of
dinners easier, whether carcasses or prey. It would seem possible to test
this via MRI. Does anyone know of work along these lines?
Scott Perry