Convergent evolution
Nectar-eaters: Four groups of songbirds from different families in different countries specialise in nectar-eating. They are the hummingbirds (Trochilidae; Americas); the sunbirds (Nectariniidae; South Africa); the honeyeaters (Meliphagidae; Australia); and the honey-creepers (Drepanididae; Hawaii).p224 They have similar adaptations because all of them use their tongue to eat nectar from the center of flowers.