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Rockhopper penguin
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==Appearance== 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.<ref name=NatGeo>{{cite web|url=http://animals.nationalgeographic.com/animals/birds/rockhopper-penguin/|archive-url=https://web.archive.org/web/20101005012834/http://animals.nationalgeographic.com/animals/birds/rockhopper-penguin/|url-status=dead|archive-date=October 5, 2010|title=Rockhopper Penguin|work=National Geographic|date=9 November 2010}}</ref> Males and females cannot be distinguished visually, so a DNA test is conducted by taking a feather from the bird to determine its gender.<ref name=Bond>{{cite web|url=http://a-z-animals.com/animals/rockhopper-penguin/|title=Rockhopper Penguin}}</ref> Like many penguins, rockhopper penguins have a white belly and the rest of their body is black.<ref name=Bond/> 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.<ref name=NatGeo/><ref name=AuGov/> Although their yellow and black spiky feathers differentiate them from other penguins, rockhopper penguin chicks do not have them; these feathers develop with age.<ref name=AuGov/> Their orange beak is initially black, but as the penguins get older, their beaks turn orange.<ref name=AuGov/> 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.<ref name=Bond/> The yellow and black βhairβ they have on the top of their head is similar to that of the Macaroni penguin (Eudyptes chrysolophus).
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