A scientist who studies animals is called a zoologist.
oceanographer
Marine Biology
Paleontogist studies extinct animals including Dinosaurs.
The name of a scientist that studies sports is called a sports scientist.
He/she is an ornithologist.Someone that studies birds is called an ornithologist.An ornothologist
An arachnologist
A scientist who studies crystals is known as a Crystallographer.
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