It’s only International Cheetah Day once a year. And it’s today!

Cheetahs are full of conundrums.

They are the fastest land animal but they tire very quickly.

They have excellent day vision but they can't see at night.

They are the only large cat that cannot roar.

Now you know some things you didn't know about cheetahs.

Happy International Cheetah Day!

1) Cheetahs look regal when they recline.

A cheetah at the Cheetah Conservation Fund center in Otjiwarongo, Namibia, Aug. 13, 2013. (Jennifer Bruce/AFP/Getty Images)

2) And regal when they stand up tall.

A cheetah with her two cubs at Masai-Mara game reserve in Kenya, April 26, 2008. (Mladen Antonov/AFP/Getty Images)

3) They look pensive up close.

An Asian Cheetah at Hamilton Zoo in New Zealand. (Dean Purcell/AFP/Getty Images

4) And kind of scary when they smile.

Three baby Cheetahs hiss for food at the Muenster zoo in Germany, May 27, 2003. (Torsten Silz/AFP/Getty Images)

5) They look cute when they're sad.

Zazi, a mother cheetah, and one of her cubs at the National Zoo in Washington, DC, June 24, 2005. (Win McNamee/AFP/Getty Images)

6) And cute when they're mad.

Three baby Cheetahs hiss for food at the Muenster zoo in Germany, May 27, 2003. (Torsten Silz/AFP/Getty Images)

7) Also cute when they rassle.

Three-month-old cheetah cubs at the National Zoo in Washington, DC, July 24, 2012. (T.J. Kirkpatrick/AFP/Getty Images)

8) Cute.

Cheetah cubs snuggle in a keeper's arms at the San Diego Zoo, Aug. 11, 200. (Tammy Spratt/Zoological Society of San Diego/Getty Images)

9) They wake with four feet on the ground.

A cheetah wakes in the morning light at the Botswana Predator Conservation Trust in Maun, Botswana, June 10, 2010. (Chris Jackson/AFP/Getty Images)

10) Ready to hunt with flair.

A cheetah at the French Damien Vergnaud private game reserve in Inverdoom, South Africa, March 22, 2013.

11) Unless they're feeling playful.

Two cheetah cubs hone their hunting abilities with an impala fawn at Masai-Mara game reserve in Kenya, April 26, 2008. (Mladen Antonov/AFP/Getty Images)

12) In which case, joke's on the impala.

A cheetah carries a live impala fawn in her mouth in Masai-Mara game reserve in Kenya, April 26, 2008. (Mladen Antonov/AFP/Getty Images)

13) They can pick up just the back of them.

A cheetah at the French Damien Vergnaud private game reserve in Inverdoom, South Africa, March 22, 2013. (Christophe Beaudufe/AFP/Getty Images)

14) And kiss with tongue.

Zazi, a mother cheetah, gets a kiss from her cub at the National Zoo in Washington, DC, June 24, 2005. (Win McNamee/AFP/Getty Images)

15) They take a moment when the light is good.

A cheetah at the Mashatu game reserve in Botswana, July 24, 2010. (Cameron Spencer/AFP/Getty Images)

16) And don't mind being pampered, not one bit.

World sprint champion Usain Bolt feeds a cheetah cub at the headquarters of the Kenyan Wildlife Service in Nairobi on Nov. 2, 2009. (Roberto Schmidt/AFP/Getty Images)

17) Cute.

One of two 9-month-old cheetahs at Zoo Miami in Florida, Nov. 29, 2012. (Joe Raedle/AFP/Getty Images)