What would you like to do?
What is a scientist called who studies rivers?
The term is parasitologist, who may also be a microbiologist.
A scientist who studies nature is called a naturalist. A Botanist
A political scientist studies politics and policy.
The study of insects is a subset of Biology called Entomology. Thus scientists who study insects (bees, ants, wasps, butterflies, moths, flies, beetles, bugs, mayflies, manti…ds, dragonflies et cetera) are called entomologists.
They are called astronomers.
A person who studies snakes - whether a scientist or not - is called a Herpetologist.