Alcedinidae
Halcyonidae
Cerylidae
Meropidae
Coliidae
Cuculidae[?]
Centropidae[?]
Coccyzidae[?]
Opisthocomidae[?]
Crotophagidae[?]
Neomorphidae[?]
Psittacidae
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... See Loss of significance for details. Derivation The quadratic formula is derived by the method of completing the square[?]. ...