Dale McGinnity has been turning over rocks in Mill Creek to study the endangered Nashville crayfish for a decade. He hopes to learn whether this little crustacean that makes its home mainly in the urbanized area around its namesake city is being harmed by all the development surrounding it. The results are encouraging. Dale McGinnity has been turning over rocks in Mill Creek to study the endangered Nashville crayfish for a decade. He hopes to learn whether this little crustacean that makes its home mainly in the urbanized area around its namesake city is being harmed by all the development surrounding it. The results are encouraging. Ecology Phys.org – latest science and technology news stories