Yes, it can be for giraffes!
Did you know that a giraffe’s super muscular heart is two feet long and weighs about 25 pounds? This awesome machinery pumps 16 gallons of blood a minute 10 feet up the long giraffe neck and 6 feet down to the toes. Therefore, a giraffe bending down to drink should feel dizzy and damage its brain, right?
Thankfully not! It so happens that a giraffe has a unique network of veins in its head that are controlled by one-way valves. These valves close to prevent blood from rushing to the head when a giraffe bends. When these valves close, the brain is sustained by the large amount of blood already trapped in these veins that continue to supply oxygen enabling the giraffe to drink.
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