Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
There's a rare breed of pig that looks like a sheep.
14
All pandas are ‘owned’ by China. They rent them out to zoos for $1mil/year each with minimum of 10 years.
16
Rattlesnake mating sessions have been known to last more than 22 hours.
232
The elephant brain weighs about 6,000g.
274