There are master programs in Zoology you can prefer to study like:



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

Post Graduate Diploma in Life Science

Master of Business Administration

Post Graduate Diploma in Life Science



Some of the other specializations in this field are:

Arachnology

Entomology

Arthropodology

Apiology

Cetology

Anthrozoology

Conchology

Ethology

Helminthology

Mammalogy

Neuroethology

Myrmecology

Nematology

Ornithology



It shall depend upon your interest which one you want to pursue your higher studies in.



Good luck.