falkrokora fu'ivla

x₁ is a cormorant/shag (family Phalacrocoracidae) fo species/breed x₂.

See also anxinga, sulmoru, fregata, cipni.

lensisku

In notes:

anxinga: x1 is an anhinga/darter (bird) of species/subtaxon x2
fregata: x₁ is a frigatebird (family Fregatidae) of species/breed x₂
sulmoru: x₁ is a booby/gannet (family Sulidae) of species/breed x₂