Cats recognise the voice of their owner, but never evolved to care.
22
The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
2
A 42-foot sperm whale has about 7 tons of oil in it.
209
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Termites are being researched as a possible renewable energy source as they can produce up to 2 litres of hydrogen from ingesting a single sheet of paper, making them one of the planet’s most efficient bioreactors.
24
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217