Yes, you can pursue an M.Sc. in Zoology from a regular university like Delhi University after completing your B.Sc. from IGNOU. Once you complete your M.Sc. in Zoology, you will have several career opportunities, including:

1. Teaching: With an M.Sc. in Zoology, you can apply for teaching positions at colleges and universities. To enhance your prospects, consider preparing for exams like NET (National Eligibility Test) for lecturer positions.

2. Research: You can pursue research roles in academic institutions, research organizations, or government bodies.

3. Wildlife and Conservation: Opportunities in wildlife conservation, environmental education, and related fields are available.

4. Laboratory Technician/Scientist: You can work in laboratories for research, diagnostics, or quality control roles.

5. Further Studies: Pursuing a Ph.D. can open doors to advanced research and academic positions.

It's a good idea to stay updated on job requirements and qualifications for your desired career path and consider any additional certifications or training if needed.