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“the heart is exceptionally large and thick-muscled, and the blood pressure—twice or three times that of man—is probably the highest in any animal.”
Biologists once wondered how a giraffe avoided a fatal hemorrhage when it lowered its neck to drink water.
“To withstand the surge of blood to and from the brain as its neck sweeps up and down,” Dr. Foster says, “the giraffe has developed control valves in the jugular veins and a special network of blood vessels in its head.”
Like others who have studied giraffes, he was impressed by their grace and gentleness. A giraffe’s slow, stately stride is deceptive;
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