audiologist
The name of a scientist that studies sports is called a sports scientist.
Audiologist
A physicist.
An arachnologist
A scientist who studies crystals is known as a Crystallographer.
someone who studies sound and it's properties is a Audiologist
A scientist who studies animals is called a zoologist.
A scientist who studies animal life is a zoologist. There is no particular name for a scientist that specialises in platypuses.
The name for this type of scientist is a teuthologist
This answer is a entomologistA scientist who only studies fish is called an ichthyologist.
environmentalist
ecologist