Chilean name: Guanay

It was these three species that provided the bulk of the guano for the incredibly lucrative trade in guano for fertiliser. The Guanay Cormorant was the most important species of the three and was known as the "billion dollar bird." Almost inevitably, given the greed of man, the guano deposits were over exploited, the birds suffered a severe decline in numbers and the trade almost disappeared.

It is a large cormorant and is black above and white below. The white breast reaches up the neck and there is a white patch on the throat. There is a patch of bare red skin around the blue eye.