An aviologist.
A scientist that studies bears would be called an ursinologist.
pomology
Gunsmith? look at the yahoo Canada answer for this.
A scientist that studies motion, forces and energy would be called a physicist.
A scientist is someone who studies science.
An ornithologist is a scientist that studies the branch of zoology that concerns birds. If he specialized in ducks he would be said to specialize in Anatidae (the family of birds which includes ducks)
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
Bridgeologist
astronomer
A meteorologist.
biologist
A vulcanologist