I don't think there is a specific branch, but there is mammalogy, which deals with all kinds of mammals.
They are called elephant biologists
Biologist or Zoologist either one.
a scatologist
Keisha Wilchcombe
A scientist is someone who studies science.
The name for a gem expert is a gemologist. They are experts in natural and artificial gems.
A scientist who studies anatomy is called a anatomist.
The name of a scientist that studies sports is called a sports scientist.
An arachnologist
A scientist who studies crystals is known as a Crystallographer.
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 of the scientist that studies artifacts remains of cultures from the past is an archeologist.
The name for this type of scientist is a teuthologist
This answer is a entomologistA scientist who only studies fish is called an ichthyologist.
Parasitologist
geologist
physicist
environmentalist