A horned toad can squirt blood out of its eyes...a fifth of all it has, in fact.
Blood pressure of spiders is about the same as that of people.
The blood of lobsters and crabs is blue...because of copper. Your blood (and the blood of other mammals) is red...because of iron.
Insects have blood, but no blood vessels.
Mexican bean beetles (and most other insects) have yellow blood.
The first blood bank was opened in 1940 in New York City.
Type O is the most common blood type in the world. Type AB is the rarest. There is also a subtype called A-H, but to date only three people in the world are known to have it.
The body has 70,000 miles of blood vessels and about 30 trillion red blood cells.
The human body produces fifteen million red blood cells — and an equal number are destroyed — every second.
The Ketchua Indians of the Andes Mountains in South America have 2 to 3 more quarts of blood in their bodies than people who live at lower elevations.
If you’re milking a cow by hand, it takes about 345 squirts to make a gallon of milk.