The black-crowned night heron ( Nycticorax nycticorax ), commonly abbreviated to just night heron in Eurasia, is a medium-sized heron found throughout a large part of the world, except in the coldest regions and Australasia (where it is replaced by the closely related rufous night heron , with which it has hybridized in the area of contact). [From Wikipedia: https://en.wikipedia.org/wiki/Black-crowned_night_heron ] ***