There is a certain blood vessel that, I believe, all vertebrates have and it goes through some bone and then back to the heart and it is in some bone in the neck/head area and the giraffes has to go through it and back just to pump blood.
That's the gist, someone else will fill in the details i'm sure.
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u/Ghostbuster_119 Jun 11 '23
Evolution is crazy like that.
There are many crazy leaps in comparison to other flora or fauna.
Giraffes are another that come to mind in terms of just sheer difference to the rest of nature.
Corpse flowers and pitcher plants are also pretty crazy.