It doesn’t take much research to find out that they do:
Here are three websites that talk about it:
...
None of your sites claim valves are in the artery. They either claim “blood vessels” or “jugular vein.” There are no valves in the artery of the giraffe.
***None of your sites claim valves are in the artery. They either claim “blood vessels” or “jugular vein.” There are no valves in the artery of the giraffe.***
Excuse me, Moonman.... I should have said “blood vessels”. Would you like to address the rest of the post?