Hiển thị các bài đăng có nhãn Penguins. Hiển thị tất cả bài đăng
Hiển thị các bài đăng có nhãn Penguins. Hiển thị tất cả bài đăng

Thứ Tư, 14 tháng 9, 2016

What are yellow-eyed penguins?

Have you ever seen yellow-eyed penguins? What are they? Let's see to know this kind of penguin facts

The yellow-eyed penguin is one of the few penguin species found north of the Antarctic Ocean, and as it's name suggests, this species of penguin is easily idenitfied by it's yellow coloured eyes and bright yellow band that runs from it's eyes round the back of the yellow-eyed penguin's head.

The yellow-eyed penguin inhabits the southern island of New Zealand, Steward Island, Campbell Island and the Auckland Islands. It is listed as an endangered species. Adults grow to 24 to 31 inches high and weigh 12 to 18 pounds. They have white undersides, gray back plumage, yellow bands running from their eyes to the backs of their heads and yellow irises.
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The main diet of yellow-eyed penguins is fish. They consume blue cod, red cod, silversides, opal fish, sprat and cephalopods, such as squid. To feed, they swim up to 16 miles offshore and dive to depths of 100 to 400 feet. Breeding season begins in mid-August and lasts until mid-February. Breeding pairs are monogamous and often return to the same nests, which are usually constructed against rocks or trees or in dense vegetation. The female lays two eggs, and both parents take turns incubating them. When the eggs hatch after 39 to 51 days, one parent guards the chicks while the other forages for food. By mid-February, the fledglings are ready to go off on their own.

In 2010, the number of yellow-eyed penguin adults was 4,000 to 4,800. Dangers to yellow-eyed penguins include habitat loss due to human settlements, entanglement in fishing nets, avian malaria, blood parasites and predation by sharks, sea lions, ferrets, ermines, cats and dogs.

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Thứ Tư, 17 tháng 8, 2016

How old grows a penguin?

It is not easy to answer the penguin facts question: "How long does a penguin live?" or "How old grows a penguin?" or "What is the life expectancy of a penguin?", here are some general remarks about it



"The average lifespan of penguins is probably 15 to 20 years. Some individuals live considerably longer (Sparks and Soper, 1987)."
(Source: Longevity and causes of death : Seaworld)

"Penguins in captivity will live longer than penguins in the wild since they are fed nutrionally balanced meals and do not have to contend with predators. Generally, penguins will live from 15 to 20 years. A female Humboldt penguin in my study group (in captivity) lived to 17 years."
(Source: Kevin Welch)


"How long do penguins live? In the wild there haven't been any reliable long term studies of individual penguins that can tell how long they live. The only such study was carried out in the 1940's and 50's by Lance Richdale in New Zealand. He monitored a population of Yellow-eyed penguins over a 15 year period. Certainly there were some chicks that he saw hatch that survived through most of the study; so it is reasonable to put the lifespan of Yellow-eyed penguins at 15 years or more. The only other information comes from studies on captive birds. Zoos and aquaria often know how old their birds are when they die. However, the common causes of death in captivity (Avian Malaria and Aspergillosis) are not particularly prevalent in the wild so the experiences with captive birds are probably under-estimates. On the other hand the captive birds will not suffer starvation if fish stocks go down suddenly and they have no predators (such as leopard seals and killer whales) to kill them. Anyway, zoos reckon birds live 10 to 20 years depending on species, with the larger species generally being longer lived."
(Source: Pete and Barbara's penguin page FAQ's)

"The oldest known penguins are about 20 years old. Most penguins don't get that old however. Less than half of all chicks live through their first year of life and about 90% of the adult penguins live from one year to the next. The average age of a penguin that shows up at Palmer to breed is probably around 6 or 7 years old."
Source: Antwoord op "Penguin's life span" door John Carlson, Research Assistant, Dr. Fraser's Team, 
Palmer Station, Antarctica, Sat, 15 Feb 1997, NASA)

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