Cows can sleep standing up, but they can only dream lying down.
745
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
Sheep, goats, octopuses, and toads have rectangular pupils.
7
Tigers can see 6 times better at night than humans.
305
Meysi is one of the world's smallest dogs, measuring in at just 7cm tall, 12cm long, and weighing a meagre 250 grams (only slightly heavier than a hamster!)
11
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
17