Giraffes: set for change

Giraffes: set for change [4 ]
''Everybody loves giraffes – how could you not. Giraffes are such fantastic and unusual mammals that all manner of questions are still being asked about their anatomy, physiology and behaviour.''

Summary
How many species of Giraffe are there, and how many neck vertebrae do they have?

Species mentioned
Giraffe Giraffa camelopardalis