,
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The neck of a giraffe isn’t all that different from any other mammal’s. There are seven neck vertebrae,
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, like those of humans, but they are much bigger. (This is a different strategy than other long-necked creatures in history. Marine reptiles called plesiosaurs,
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, for instance, had 38 to 42 vertebrae to lengthen their necks.)
How giraffes evolved their long necks has long been the subject of debate,
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, dating back to the early days of evolutionary theory. French naturalist Jean Baptiste Lamarck,
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, for instance,
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, suggested that the giraffe neck lengthened as the animals stretched to reach leaves high in trees, with a “nervous fluid” flowing into the neck to make it longer. The giraffe’s offspring would inherit the longer neck,
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, then stretch to reach even higher leaves, and that even longer neck would get passed on.
That’s not how evolution works, though. Animals that had longer necks had some sort of advantage, and they were able to pass on their genes, eventually resulting in super-long necked animals. Just what that advantage might have been is still unknown. Perhaps the feature let giraffes access more food resources high in the treetops. But since female giraffes prefer males with longer necks,
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, sexual selection might also be involved.

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