Ornithologist.
A scientist who studies mollusks is called a teuthologist.
a marine biologist
An Ecologist. Hope I helped :)
A scientist that studies bats is called a chiropterologist.
An Entemologist
A biotechnology scientist.
An Oceanographer. Marine Biologist, that sort of thing.
A scientist that studies viruses is called a virologist.
A scientist who studies mollusks is called a teuthologist.
A scientist that studies bears would be called an ursinologist.
virologist
An aviologist.
A meteorologist.
biologist
A vulcanologist
Mineralogists
Bridgeologist