Rockhopper penguins are the most widespread of the crested penguins and also the smallest.
In some localities Rockhopper numbers have decreased alarmingly due in part to disease, introduced species and possibly warming seas.
'Rockies' have a very loud cry called 'ecstatic vocalization', which is used to announce their presence, to attract a mate or to state their territory. Also, by shaking their heads they cause their yellow eyebrows to fly into a 'halo' in order to attract a mate.
As in many penguin species, male Rockhoppers are capable of producing 'milk' from their digestive systems which they then regurgitate for their chicks when the female is away hunting for food.
Photographed at Sea World, Orlando, FL
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