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1) There are roughly 10 million/500 million/1000 million domestic cats in the world.
2) On average cats weigh 1.5/4.5/8 kg.
3) Domestic cats sleep on average 8-9/13-14/18-19 hours a day.
4) There are roughly 400 million/600 million/800 million domestic dogs in the world.
5) The average life of a dog is 10-14/14-18/18-20 years.
6) Dolphins live in groups called pods or schools of up to 12/20/30 individuals.
7) Adult elephants need to drink about 100/200/400 litres of water a day.
8) A giraffe's neck is about 120/170/220 cm long.
9) A giraffe's tail hair is 2/5/10 times as thick as the average human hair.
10) An average male lion weighs 180/250/330 kg.
11) A lion's roar can be heard 8/12/16 kms away.
12) Lions rest for 10/15/20 hours a day on average.