The black-browed albatross (Thalassarche melanophris), also known as the black-browed mollymawk, is a large seabird of the albatross family Diomedeidae it is the most widespread and common member of its family. They nest in large colonies on the cliffs facing south and west to take advantage of the predominant winds for takeoff and landing. They build their nest out of guano, mud and tussock grass and their lifespan may be up to 70 years. They nest alongside Rockhopper penguins, Rockhopper penguins (Eudyptes chrysocome) are among the smaller species of penguin. After reaching full growth, they are about 20 inches or 50 centimetres in height. Males and females cannot be distinguished visually, so a DNA test is conducted by taking a feather from the bird to determine its gender. Like many penguins, rockhopper penguins have a white belly and the rest of their body is black. Some characteristics that differentiate them from the other penguins are their red eyes, orange beak, pink webbed feet, and the yellow and black spiky feathers they have on their head. Although their yellow and black spiky feathers differentiate them from other penguins, rockhopper penguin chicks do not have them these feathers develop with age. Their orange beak is initially black, but as the penguins get older, their beaks turn orange. Due to the harsh rocky environment, they cannot slide on their bellies like most penguins, so they hop to get from one place to another, hence their name.The yellow and black 'hair' they have on the top of their head is similar to that of the Macaroni penguin (Eudyptes chrysolophus).
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