Blue series
A variant of Parakeet (Budgerigar) (Melopsittacus undulatus)

Representative Parakeet (Budgerigar)photo — a dedicated image of this exact morph isn't available yet.
A recessive mutation that removes yellow pigment, turning the green body sky-blue (or cobalt/mauve in dark-factor birds) with a white face.
Keeper tips for this variant
Care is identical to wild-type; just pair two blue-series birds to reliably produce blue chicks, since blue is recessive to green.