Michael & Patricia Fogden / White-necked Jacobin (Florisuga mellivora) hummingbird male feeding on nectar of Fairy Duster (Calliandra sp) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Murray Cooper / White-necked Jacobin (Florisuga mellivora) male feeding on flower nectar, Ecuador

Ingo Arndt / Monarch (Danaus plexippus) butterfly feeding on nectar of Goldenrod during migration, East Coast, USA

Konrad Wothe / Blue-tailed Hummingbird (Amazilia cyanura) feeding at flowers, Honduras

Michael Durham / Honey Bee (Apis mellifera) worker collecting nectar from Red Clover (Trifolium pratense) flowers, note the pollen baskets on the legs, northwest Oregon

Michael Durham / Bumblebee (Bombus huntii) flying toward the camera after collecting nectar from a Rhododendron flower, northeast Oregon

Michael & Patricia Fogden / White-necked Jacobin (Florisuga mellivora) hummingbird male feeding on nectar from a Bromeliad flower, La Selva Biological Research Station, Rainforest, Costa Rica

Michael & Patricia Fogden / Magenta-throated Woodstar (Calliphlox bryantae) hummingbird male feeding on epiphytic Heath (Cavendishia complectens) nectar, rainforest, Costa Rica

Michael & Patricia Fogden / Blue-chested Hummingbird (Amazilia amabilis) feeding on nectar from flowers (Hamelia sp) rainforests of Costa Rica

Michael & Patricia Fogden / Monarch (Danaus plexippus) butterfly, feeding on Scarlet Milkweed (Asclepias curassavica) in the cloud forest, Costa Rica

Michael & Patricia Fogden / Passionvine Butterfly (Heliconius clysonimus) attempting to feed at Crucifix Orchid (Epidendrum radicans) the original mimics Lantana sp and Asclepias curassavica but provides no nectar

Tom Vezo / Broad-billed Hummingbird (Cynanthus latirostris) male at yellow cactus flower, Arizona

Mark Moffett / Ant (Pseudomyrmex sp) group drink nectar from Whistling Thorn (Acacia drepanolobium) acacia tree and protect the tree from leaf eating enemies ensuring mutual survival, Costa Rica

Mitsuaki Iwago / Pygmy Possum (Cercartetus sp) licking nectar from a Coastal Banksia (Banksia integrifolia), Australia

Mitsuhiko Imamori / Honeypot Ant (Camponotus inflatus) repletes hanging from ceiling of larder, engorged with nectar they will regurgitate on demand to other workers, central Australia

Mitsuaki Iwago / Honeypot Ant (Camponotus inflatus) repletes hanging from ceiling of larder, engorged with nectar they will regurgitate on demand to other workers, central Australia

Mitsuaki Iwago / Honeypot Ant (Camponotus inflatus) repletes hanging from ceiling of larder, engorged with nectar they will regurgitate on demand to other workers, central Australia

Tim Fitzharris / Broad-tailed Hummingbird (Selasphorus platycercus) feeding on the nectar of a Desert Penstemon (Penstemon pseudospectabilis) flower, New Mexico

Tim Fitzharris / Rufous Hummingbird (Selasphorus rufus) feeding on the nectar of a Desert Figwort (Scrophularia desertorum), New Mexico

Tim Fitzharris / Broad-tailed Hummingbird (Selasphorus platycercus) feeding on the nectar of a Scarlet Bugler flower, New Mexico

Tim Fitzharris / Broad-tailed Hummingbird (Selasphorus platycercus) feeding on the nectar of a Desert Penstemon (Penstemon pseudospectabilis) flower, New Mexico

Tim Fitzharris / Violet Sabre-wing (Campylopterus hemileucurus) male feeding on flower nectar, Ecuador

Tim Fitzharris / Rufous-tailed Hummingbird (Amazilia tzacatl) feeding on flower nectar, Costa Rica

Tim Fitzharris / Sword-billed Hummingbird (Ensifera ensifera) feeding on flower nectar, Ecuador

Tim Fitzharris / Violet Sabre-wing (Campylopterus hemileucurus) male feeding on flower nectar, Ecuador

Tim Fitzharris / Rufous Hummingbird (Selasphorus rufus) male and Black-chinned Hummingbird (Archilochus alexandri) female feeding on flower nectar

Tim Fitzharris / Rufous Hummingbird (Selasphorus rufus) male feeding on flower nectar

Tim Fitzharris / Long-tailed Sylph (Aglaiocercus kingi) feeding on flower nectar, Jurong Bird Park, Singapore

Tim Fitzharris / Sword-billed Hummingbird (Ensifera ensifera) feeding on flower nectar, Ecuador

Tim Fitzharris / Broad-tailed Hummingbird (Selasphorus platycercus) feeding on flower nectar, Santa Fe, New Mexico

Tim Fitzharris / Booted Racket-tail (Ocreatus underwoodii) hummingbird male feeding on flower nectar, Ecuador

Tom Vezo / Booted Racket-tail (Ocreatus underwoodii) male feeding on flower nectar

Martin Willis / Musk Lorikeet (Glossopsitta concinna) on flowering eucalyptus, Hobart, Tasmania, Australia

Martin Willis / Musk Lorikeet (Glossopsitta concinna) feeding on eucalyptus flower nectar, Hobart, Tasmania, Australia

Tom Vezo / Rufous Hummingbird (Selasphorus rufus) feeding on flower nectar, North America

Tom Vezo / Lesser Long-nosed Bat (Leptonycteris yerbabuenae) feeding on Agave flower nectar, North America

Tom Vezo / Fawn-breasted Brilliant (Heliodoxa rubinoides) hummingbird female feeding on flower nectar

Tom Vezo / Buff-bellied Hummingbird (Amazilia yucatanensis) feeding on flower nectar, Rio Grande Valley, Texas

Tom Vezo / Blue-throated Hummingbird (Lampornis clemenciae) feeding on flower nectar, southern Arizona

Tom Vezo / Anna's Hummingbird (Calypte anna) feeding on flower nectar, Santa Rita Mountains, Arizona

Steve Gettle / Violet-tailed Sylph (Aglaiocercus coelestis) hummingbird feeding on flower nectar, Ecuador

Steve Gettle / Empress Brilliant (Heliodoxa imperatrix) hummingbird feeding on flower nectar

Steve Gettle / Brown Inca (Coeligena wilsoni) hummingbird feeding on flower nectar, Ecuador

Steve Gettle / Buff-tailed Coronet (Boissonneaua flavescens)hummingbird feeding on flower nectar, Ecuador

Steve Gettle / Empress Brilliant (Heliodoxa imperatrix) hummingbird feeding on flower nectar

Steve Gettle / Buff-tailed Coronet (Boissonneaua flavescens) hummingbird feeding on flower nectar, Ecuador

Steve Gettle / Velvet-purple Coronet (Boissonneaua jardini) male hummingbird feeding on flower nectar, Ecuador

Steve Gettle / Fawn-breasted Brilliant (Heliodoxa rubinoides) male hummingbird feeding on flower nectar, Ecuador

Steve Gettle / Empress Brilliant (Heliodoxa imperatrix) female hummingbird feeding on flower nectar

Martin Willis / Western Pygmy Possum (Cercartetus concinnus) seeking nectar on red banksia flower, Cheyne Beach, Western Australia, Australia

Martin Willis / Olive-backed Sunbird (Cinnyris jugularis) male feeding on nectar, Townsville, Queensland, Australia

Martin Willis / Scaly-breasted Lorikeet (Trichoglossus chlorolepidotus) feeding on nectar, Townsville, Queensland, Australia

Martin Willis / Red Wattlebird (Anthochaera carunculata) male feeding on Kangaroo Paw (Anigozanthos sp) flower nectar, Darling Range, Western Australia, Australia

Martin Willis / Rainbow Lorikeet (Trichoglossus haematodus) feeding on nectar from flowers, Townsville, Queensland, Australia

Martin Willis / Feather-tail Glider (Acrobates pygmaeus) gathering nectar from Silk Oak (Grevillea robusta) flower, Martinsville, New South Wales, Australia

Martin Willis / Dusky Myzomela (Myzomela obscura) feeding on Umbrella Tree (Musanga sp) nectar, Townsville, Queensland, Australia

Mark Moffett / Orchid Bee (Euglossa sp) male visiting Orchid (Mormodes sp) flower

Konrad Wothe / Small Striped Swordtail (Graphium policenes) and Nymphalid Butterfly (Nymphalidae) feeding on flower nectar, Mahale Mountains National Park, Tanzania

Konrad Wothe / Butterfly (Danaus sp) feeding on flower nectar, Mahale Mountains National Park, Tanzania

Konrad Wothe / Honey Bee (Apis mellifera) feeding on flower nectar, Bavaria, Germany

Donald M. Jones / Rufous Hummingbird (Selasphorus rufus) female feeding on flower nectar, Troy, Montana

Donald M. Jones / Rufous Hummingbird (Selasphorus rufus) male feeding on Paintbrush (Castilleja sp) flower nectar, Troy, Montana

Donald M. Jones / Calliope Hummingbird (Stellula calliope) male feeding on Paintbrush (Castilleja sp) flower nectar, Troy, Montana

Donald M. Jones / Calliope Hummingbird (Stellula calliope) male feeding on flower nectar, Troy, Montana

Steve Gettle / Slaty Flower-piercer (Diglossa plumbea) male feeding on flower nectar, Costa Rica

Steve Gettle / White-necked Jacobin (Florisuga mellivora) hummingbird male feeding on flower nectar, Costa Rica

Steve Gettle / White-necked Jacobin (Florisuga mellivora) hummingbird female feeding on flower nectar, Costa Rica

Steve Gettle / Violet-crowned Woodnymph (Thalurania colombica) hummingbird male feeding on flower nectar, Costa Rica

Steve Gettle / Green Violet-ear (Colibri thalassinus) hummingbird feeding on flower nectar, Costa Rica

Martin Willis / Scaly-breasted Lorikeet (Trichoglossus chlorolepidotus) feeding on Pink Flowered Doughwood (Melicope elleryana) nectar, Townsville, Queensland, Australia

Martin Willis / Scaly-breasted Lorikeet (Trichoglossus chlorolepidotus) feeding on Pink Flowered Doughwood (Melicope elleryana) nectar, Townsville, Queensland, Australia

Michael & Patricia Fogden / Green-fronted Lancebill (Doryfera ludovicae) hummingbird feeding on nectar of Heath (Psammisia aberrans) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / Purple-bibbed Whitetip (Urosticte benjamini) hummingbird male feeding on nectar of Cinchona (Cinchona sp) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / Purple-bibbed Whitetip (Urosticte benjamini) hummingbird male feeding on nectar of Cinchona (Cinchona sp) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / Green Violet-ear (Colibri thalassinus) hummingbird feeding on nectar of Bromeliad (Pitcairnia commixta) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / Booted Racket-tail (Ocreatus underwoodii) hummingbird male feeding on nectar of Bomarea (Bomarea multiflora) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / White-necked Jacobin (Florisuga mellivora) hummingbird male feeding on nectar of Canna (Canna sp) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / Green-fronted Lancebill (Doryfera ludovicae) hummingbird feeding on nectar of Heath (Psammisia columbiensis) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / Sparkling Violet-ear (Colibri coruscans) hummingbird male feeding on nectar of Heath (Cavendishia bracteata) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / Empress Brilliant (Heliodoxa imperatrix) hummingbird male feeding on nectar of Heath (Macleania ericae) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / Empress Brilliant (Heliodoxa imperatrix) hummingbird female feeding on nectar of Heath (Cavendishia bracteata) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / Green-tailed Trainbearer (Lesbia nuna) hummingbird male feeding on nectar of Sage (Salvia sp) flower in temperate forest, Ecuador

Michael & Patricia Fogden / Sparkling Violet-ear (Colibri coruscans) hummingbird male feeding on nectar of Heath (Cavendishia bracteata) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / Sparkling Violet-ear (Colibri coruscans) hummingbird male feeding on nectar of Heath (Cavendishia bracteata) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / Violet-bellied Hummingbird (Damophila julie) male on Gesneria (Kohleria sp) flower, western Ecuador

Michael & Patricia Fogden / Sword-billed Hummingbird (Ensifera ensifera) male feeding on nectar of Rosy Passion Fruit (Passiflora cumbalensis) flower in temperate forest, Verdecocha Ecological Reserve, western slope of Andes, Ec...

Michael & Patricia Fogden / Ruby-throated Hummingbird (Archilochus colubris) immature male feeding on nectar of Porterweed (Stachytarpheta frantzii) flower in dry forest, northwestern Costa Rica

Michael & Patricia Fogden / Western Emerald (Chlorostilbon melanorhynchus) hummingbird male feeding on nectar of Bomarea (Bomarea multiflora) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / Booted Racket-tail (Ocreatus underwoodii) hummingbird male feeding on nectar of Bomarea (Bomarea multiflora) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / Booted Racket-tail (Ocreatus underwoodii) hummingbird male feeding on nectar of Tiger Orchid (Elleanthus robustus) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Michael & Patricia Fogden / White-necked Jacobin (Florisuga mellivora) hummingbird male feeding on nectar of Canna (Canna sp) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Christian Ziegler / Pallas' Long-tongued Bat (Glossophaga soricina) feeding on nectar of Pseudobombax (Pseudobombax sp) flower, Smithsonian Tropical Research Station, Barro Colorado Island, Panama

Christian Ziegler / Pallas' Long-tongued Bat (Glossophaga soricina) feeding on nectar of Pseudobombax (Pseudobombax sp) flower, Smithsonian Tropical Research Station, Barro Colorado Island, Panama

Mark Moffett / I'iwi (Drepanis coccinea) feeding on flower nectar, Haleakala National Park, Maui, Hawaii

Mark Moffett / Heliconius Butterfly (Heliconius eratonia) feeding on nectar of Hot Lips (Psychotria poeppigiana) blossom, Panama

Mark Moffett / Ornate Day Gecko (Phelsuma ornata) feeding on nectar from Bois Boeuf (Gastonia mauritiana) blossoms, Mauritius