Family NECTARINIIDAE .
In this family the edges of both mandibles are finely and evenly serrated on the terminal half or third of their edges, a character which at once separates them from all other Passeres except the Dicaeidae. The tongue is tubular; the bill is moderately or very long and more or less cylindrical; the rictal bristles short; the wing is of ten primaries, the first small; the tail has twelve rectrices ; the tarsi are slender in most though fairly long, in others short and stronger; they are scutellated; there is one full moult and one partial in the year and the young are like the adult female -r the sexes are sometimes alike and sometimes dissimilar.
Key to Subfamilies.
A. Sexes different; plumage of male in part metallic; bill slender…..Nectariniidae, p. 372.
B. Sexes alike; plumage non-metallic………..Arachnotherinae, p. 413.