Lions are the only cats that do not purr.
In Denmark there is a special military unit that uses dog sleds for official transport.
Heroin was once used as a cough medicine.
In one day the heart beats around 100.800 times. It pumps through the blood vessels as much blood as it would take to fill about 170 average bathtubs.
Asian elephants have the longest gestation period of all mammals, it lasts 608 days.
On average, adults laugh fifteen times a day.
