* Formal: My passion for zoology led me to pursue a degree in wildlife biology.
* Descriptive: The professor's lecture on the evolution of primates was a fascinating introduction to the field of zoology.
* Informal: I spent hours at the zoo, my inner zoologist trying to identify every species.
* Humorous: My dog's obsession with chasing squirrels is definitely a testament to his zoological instincts.
The best way to use the word will depend on the context of your sentence and your intended meaning.