On a recent trip to Taronga Zoo in Sydney, Australia I recently captured two rare things on film. The first being a Platypus as they rarely come out in the day and the second was the interaction between it and a Cormorant bird attacking / playing with each other in the water.
Filmed with my Nikon D5100 using a 17-55mm lens http://en.nikon.ca/Nikon-Products/Product/Digital-SLR-Cameras/25478/D5100.html