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They happen to only have one heart. however it is incredibly large.

Wikipedia http://en.wikipedia.org/wiki/Giraffe

"A giraffe's heart, which can weigh up to 10 kg (22 lb) and measure about 60 cm (2 ft) long, must generate approximately double the normal blood pressure for an average large mammal to maintain blood flow to the brain. In the upper neck, a complex pressure-regulation system called the rete mirabile prevents excess blood flow to the brain when the giraffe lowers its head to drink."

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9y ago

What else can I help you with?