why are there so many diffrent types of Green Cheek Conures?

by Tara
(MA)

why are there so many diffrent types of Green Cheek Conures? are they hybrids? within the conure parrot family, why are there "Pineapple" "Cinnimin" "Turquise" "Yellow sided" Green cheek conures? when there is only 1 type of all the rest? example; Nanday,Sun,Half-Moon,Jenday,blue crowned....

I was wondering if there is only 1 Green Cheek, and the rest are reconized hybrids? and if the other types of Green cheeks, why is the Green Cheek family the only Conure group like this?