The mangrove forests of Sunderbans (among the largest in the world) aren't just home to the Royal Bengal Tiger and crocodiles. They also provide shelter to an incredible variety of birds that you can spot while navigating the many rivers and channels. Look out for a variety of waders, raptors and kingfishers along with rare birds like the buffy fish owl and the goliath heron. You can also spot deer, wild boars, king crabs and olive ridleys at this UNESCO World Heritage Site.