A scientist who studies animals that produce their own light is called a bioluminescence researcher or a marine biologist specializing in bioluminescent organisms.
A person who studies snowflakes is called a cryologist or a snowflake scientist.
An Astronomer is a scientist who studies the stars and planets.
A person who studies Mars is typically referred to as a Martian scientist or a Mars researcher.
An astronomer.
A scientist that studies bats is called a chiropterologist.
A scientist who studies mollusks is called a teuthologist.
The name of a scientist that studies sports is called a sports scientist.
A scientist is someone who studies science.
A scientist who studies butterflies and moths is called a lepidopterist.
An Entemologist
A scientist who studies animals is called a zoologist.
A scientist that studies fungi is called a mycologist.
A scientist who studies insects is called an "entomologist".
A scientist that studies viruses is called a virologist.
A scientist who studies radioactivity is called a nuclear physicist or a radiologist.
A scientist who studies anatomy is called a anatomist.