Dragonair's height is 13'01"
whereas
Dragonite's height is 7'03".
Dragonair
Dragonite
Aren't Pokemon meant to get bigger when they evolve?
Does Dragonites Height change or something?

If Dragonite is 7'03"
and a average human is 5'10" but in the picture above the Dragonite is clearly bigger than 7'03".
Is that Dragonite special in anyway?
I realise there are a few questions in there but I couldn't be bothered to do 3-4 seperate questions.
Thanks in Advance!