Table 1 Representative species from divergent taxa of nectarivorous (with double asterisks) and non-nectarivorous (without asterisks) diet used in this study

1

Lorikeets and budgerigars and an outgroup

Lorius garrulus (nectarivore)**

Chattering Lorry

Melopsittacus undulatus (non-nectarivore)

Budgerigar

Pionus menstruus (non-nectarivore)

Blue-headed Parrot

2

Sunbird-asities and broadbills

Neodrepanis hypoxtha (nectarivore)**

Yellow-bellied Sunbird-asity

Smithornis rufolateralis (non-nectarivore)

Rufous-sided Broadbill

3

Hanging parrots and lovebirds/guaiaberos

Loriculus galgulus (nectarivore)**

Blue-crowned Hanging Parrot

Loriculus phili (nectarivore)**

Philippine Hanging Parrot

Agapornis cana (non-nectarivore)

Grey-headed Lovebird

Bolbopsittacus lunulatus (non-nectarivore)

Guaiabero

4

Hummingbirds and swifts

Calypte anna (nectarivore)**

Anna’s Hummingbird

Archilochus colubris (nectarivore)**

Ruby-throated Hummingbird

Apus affinis (non-nectarivore)

House Swift

Cypseloides rutilus (non-nectarivore)

Chestnut-collared Swift

Chaetura pelagica (non-nectarivore)

Chimney Swift

5

Saffron-crowned tanager and related tanagers

Tangara xanthocephala (nectarivore)**

Saffron-crowned Tanager

Tangara florida (non-nectarivore)

Emerald Tanager

Tangara icterocephala (non-nectarivore)

Silver-throated Tanager

6

Flowerpeckers/sunbirds and motacillidae

Arachnothera longirostra (nectarivore)**

Little Spiderhunter

Dicaeum trigonostigma (nectarivore)**

Orange-bellied Flowerpecker

Anthus lutescens (non-nectarivore)

Yellowish Pipit

Anthus novaeseelandiae (non-nectarivore)

Newzealand Pipit

7

Green Honeycreeper and related tanagers

Chlorophanes spiza (nectarivore)**

Green Honeycreeper

Heterospingus rubrifrons (non-nectarivore)

Sulphur-rumped Tanager

8

O. larvatus and O. nigripennis

Oriolus larvatus (non-nectarivore)**

Black-headed Oriole

Oriolus nigripennis (nectarivore)

Black-winged Oriole

9

T. episcopus and T. sayaca

Thraupis episcopus (nectarivore)**

Blue-gray Tanager

Thraupis sayaca (non-nectarivore)

Sayaca Tanager

10

Banaquits and grassquits

Coereba flaveola (nectarivore)**

Bananquit

Tiaris olivaceus (non-nectarivore)

Yellow-faced Grassquit