Rosy: I had a peak in Wikipedea and found this:
"Although they are completely unrelated, the sunbirds find counterparts in the hummingbirds of the Americas and the honeyeaters of Australia. The resemblances are due to convergent evolution due to the similar nectar-feeding lifestyle".
"Like the hummingbirds, they are strongly sexually dimorphic, with the males usually brilliantly plumaged in metallic colours. Sunbirds have long thin down-curved bills and brush tipped tubular tongues, both adaptations to their nectar feeding. Up to three eggs are laid in a purse-shaped suspended nest."
So there is a resemblance...