Who can resist the sight of a penguin, be it sheltering against the Antarctic weather with its colony, taking a graceful swim or looking cute as a fluffy chick.

With everyone celebrating Penguin Appreciation Day, what more of an excuse do we need to serve up a smattering of pictures and a bevy of facts about the birds.

1. Speedy swimmer

Penguins swimming sedately
(Terry Scott/Demotix/PA)

Don’t be fooled by the sedate poses of these Humboldt penguins in the water. Some penguins can swim as fast as 20mph.

That’s because they are aided by a process known as porpoising. Tipenguinses of air coat their feathers reducing friction with the water’s surface so they can power along.

They also have extremely powerful flippers and streamlined bodies which make them excellent swimmers. In fact, they are the fastest swimming and deepest diving species of any bird.

2. Penguin poo helps scientists find new colonies from space

(H. Reinhard/DPA/PA)

That’s because penguin and seabird poo, actually called guano, has a unique spectral signature which can be identified from satellite imagery using infra red. Basically, if they can see a lot of staining, chances are something has been to the toilet, and that something is a penguin.

3. There are 18 types of penguins in the world

Five of them are thought to be endangered and facing possible extinction unless strong conservation measures are taken, like the work of The Truell Charitable Foundation.

4. Meet the Adelie penguin

Adelie pengui
It’s all about the eyes (Bai Yang/Landov/PA)

The Adelie penguin is one of the smallest and most widely-found penguins on Antarctica. To recognise it quickly, check out the white ring around each eye. It can dive to 180 metres, but catches food closer to the surface. There’s thought to about five million left and listed as ‘near threatened’.

5. The Southern hemisphere rocks!

an Emperor penguin is seen on Peka Peka Beach of the Kapiti Coast in New Zealand.
(Mark Mitchell/AP/PA)

Well it does for penguins. We might have penguins in our John Lewis Christmas adverts and zoos, but really these birds are at home in the Southern Hemisphere.

6. When a penguin lives ‘up north’, it actually means….

There are penguins on the Galapagos Islands. The Galapagos penguin is the northernmost species, living around the equator. Not north at all.

7. African penguins

An African Penguin aka Black-footed Penguin
(Federico Gambarini/DPA/PA)

African penguins enjoy an average life expectancy of about 20 years in the wild. In general, penguins can live for anything between 15-20 years.

8. Happy at sea

(Frank Gunn/AP/PA)
(Frank Gunn/AP/PA)

Penguins spend about 60% of their lives at sea. In fact, they spend so much time in the water, their eyesight is far superior beneath the surface than above in the air. They can even drink sea water.

9. Funny guys

Fiordland penguin
Fiordland penguin (Rick Rycroft/AP/PA)

We can’t help but smile at this picture of a Fiordland penguin. But they are another species which is listed as vulnerable.

10. Humboldt penguin chicks are really cute

A newly-hatched penguin cries
(Bullit Marquez/AP/PA)

This chick was born in a zoo (hence why it’s being handled), but in the wild, a Humboldt penguin can expect to live for about 20 years, living on a diet of herring, anchovies, and smelt. They are most likely to be found in South America, on the coast of Peru and Chile.

11. Tricky to count

Adelie penguin (Bai Yang/Landov/PA)
Adelie penguin (Bai Yang/Landov/PA)

We’ve already heard how poo has helped to spot new penguin colonies, but even before that, Very High Resolution satellites were used to count penguins. That’s how in 2012, British Antarctic Survey (BAS) researchers counted 595,000 birds, almost double previous estimates of between 270,000 and 350,000. But they are really sociable animals with some breeding colonies numbering in the tens of thousands.

12. Quick growth

A newly-hatched penguin
(Bullit Marquez/AP/PA)

Penguin chicks usually put on 10% of their body weight every day. Penguins can eat a variety of sealife, including krill, fish, shrimp and even squid.

13. Big and small

A two-week-old Little Penguin rests against a stuffed animal
Little Penguin, the one on the right, just to avoid confusion (Al Behrman/AP/PA)

The largest penguin is the Emperor penguin, which can also stay underwater for 20 minutes, while the smallest is imaginatively-called Little Penguin or Little Blue Penguin. This little fellow is two weeks old, and was born at a Cincinnati Zoo, but Little Penguins are found in Australia and New Zealand. Adults stand just over 25cm and weigh about a kilo.