Scientist believe the first giraffes on earth have shorter legs in a shoulder neck then draft today what can you conclude about these first giraffes

They had food sources that were low to the ground.

These giraffes were at a disadvantage compared to today's girrafes. They most likely had to compete with other vegetarians and cannot reach higher places where vegetation is prominent. Over many years, they went through the process of evolution and gained the benefit of longer necks.