Thanks for the question.

You have lot of scope after doing bsc in Zoology -

Master of Science in Marine Zoology

Master of Science in Zoology with specializations in Medical Microbiology

Master of Science in Zoology

Master of Philosophy in Zoology

Doctor of Philosophy in Zoology

One can specialize in various fields within zoology; some of them are listed as follows:

Arachnology

Entomology

Arthropodology

Apiology

Cetology

Anthrozoology

Conchology

Ethology

Helminthology

Mammalogy

Neuroethology

Myrmecology

Nematology

Ornithology

Paleozoology

Malacology

Primatology

Herpetology