Caiques are divided into 2 species and 5 subspecies:-

Pionites melanocephalus = Black-headed caique

Pionites melanocephalus pallidus = Pallid caique.

Pionites leucogaster = White-bellied caique

Pionites leucogaster leucogaster = Green-thighed caique
Pionites leucogaster xanthomerius = Yellow-thighed caique
Pionites leucogaster xanthurus = Yellow-tailed caique

The Yellow-thighed Caique Pionites leucogaster Sub-species: Pionites l. xanthomeria Yellow-thighed Caique Pionites l. leucogaster White-bellied (White-breasted) Caique Pionites l. xanthurus Yellowed-tailed Caique

White-bellied or White-breasted Caique Pionites leucogaster Sub-species: Pionites l. xanthomeria Yellow-thighed Caique Pionites l. leucogaster White-bellied (White-breasted) Caique Pionites l. xanthurus Yellowed-tailed Caique

Black-headed Caique Pionites melanocephala Sub-species: Pionites melanocephala melanocephala Black-headed Caique Pionites melanocephala pallida (Berlepsch)

Yellow Tailed Caique Pionites leucogaster xanthurus

Green Thighed Caique Pionites leucogaster leucogaster

Pallid Caique Pionites melanocephalus pallidus

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