The pink-eared duck (Malacorhynchus membranaceus) is a species of duck found in Australia. It has a large spatulate bill. Its brown back and crown, black and white barred sides and black eye patches on its otherwise white face make this bird unmistakable. Its name refers to a pink spot in the corner formed by the black head pattern and is only noticeable at close distance. It's commonly known as the zebra duck.
Thanks Keith. They didn't bother swimming off when I approached so it was a great experience to see them just being themselves on the bank.