Giraffes have such long necks. Do they have a lot of neck bones?
user
Necks are made up of a number of vertebrae, but a giraffe has a relatively simple vertebral column, with seven vertebrae.
assistant
Wow! That is the same as humans?
user
As humans, we have seven vertebrae as well.
assistant
Why do giraffes have so long necks and humans don't?
user
The length of the giraffe's neck is a result of its special evolutionary history.  In particular, a “long neck” would be of use for giraffes in reaching tall trees and their high, nutritious leaves.  In contrast, humans evolved from apes that had short arms and short necks.  A long neck would not have been of value to our ape ancestors.
assistant
Giraffes have such long necks. Do they have a lot of neck bones?
user
Necks are made up of a number of vertebrae, but a giraffe has a relatively simple vertebral column, with seven vertebrae.
assistant
Wow! That is the same as humans?
user
As humans, we have seven vertebrae as well.
assistant
Why do giraffes have so long necks and humans don't?
user
The shape of the giraffe’s neck bone is a combination of factors: its length, the shape of the neck muscles, the growth of the neck during development, and genetic factors.
assistant
Giraffes have such long necks. Do they have a lot of neck bones?