A person who works with tigers is often referred to as a tiger handler, tiger trainer, or wildlife caretaker. They may also be known as a zookeeper if their work is in a zoo setting. Additionally, those involved in conservation efforts might be called wildlife biologists or conservationists, depending on their specific role and responsibilities.
A slang word for people who love wildlife would be "granola."
Tech Person
a slave
Employee
someone who works for a business
hydrologist
moofer
A Chronogist
A mathematician
A BarMan
Railroader