Zoology is a very broad field of study. To be successful in your endeavour, you would need to state your field of specialisation and the kinds of research in which you are interested. Best of luck

Dear Raj,  There are SO MANY opportunities for you :-)  Here are just a few:

Earth Institute at Columbia University 

http://www.earthinstitute.columbia.edu/articles/view/34

EMBO (life sciences in the EU)

http://www.embo.org/funding-awards/fellowships/short-term-fellowships

The Bayer Foundation fellowships

http://www.bayer-foundations.com/en/international-fellowship.aspx

and the University of Queensland has a visiting scholars program

http://www.biology.uq.edu.au/index.html?page=36581

And Raj, these are just with a 0.12s search of the internet :-)  I think that you should be very focused about what exactly you want out of the experience, what skills you want to learn, who you want to visit and learn from, and what you can bring to the institution you visit.  Think about this as a trade - where you give something they want and you receive what you want from them.  Good luck!

Thank you David bickford