Black-crowned Night Herons are a wide ranging species of heron. They are medium sized herons with a black patch on top of their heads that gives them their names. They have off-white to grey bodies with dark blue-ish grey wings, red eyes and a few long white plumes at the back of the neck. They are named “night herons” because of their preference to hunt at dusk and night time. They nest in groups, sometimes with other species, and are thought to mate monogamously, which means they have one mate for life.