Saturday, October 6, 2012

Crested Penguin


The Life of Animals | Crested Penguin | Crested penguins are similar in appearance, have clearly defined black and white plumage with red beak and prominent yellow crest. The real penguin (especially) has a white face, while other species have black faces. Crested penguins lay two eggs, but usually only raise a young and successful. All species have the curious phenomenon of egg size dimorphism in breeding, the first egg (or egg), which is substantially lower than the second egg (B-egg). British ornithologist David Lack gender theory evolved into the construction of a single egg clutch.

Recently penguin breeding and peak drawn was reported that eggs smaller than the second peak is expected. DNA evidence suggests that mitochondrial and nuclear crested penguins ancestors split from its closest relative, the yellow-eyed penguin middle Miocene about 15 million years before splitting into separate species about 8,000,000 years ago, at the end of the Miocene. Type fossil penguin Madrynornis was identified as the closest known relative of rockhopper penguins.

Six extant species have been traditionally recognized, with the recent division of Penguin Rockhopper bringing in September, however, the close relationship of macaroni and penguins, and erect-crested penguins and Snares have led some to propose that the two pairs must be considered as a species. 

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