Nick Garbutt,Nick Garbutt / Tourist watching masses of butterflies drinking from temporary pools. Various species including Large Orange Sulphur (Phoebis agarithe), Cloudless Sulphur (Phoebis sennae), White-angled Sulphur (Anteo...

Pete Oxford / Galapagos Sulphur Butterfly (Phoebis sennae marcellina) feeding on cactus flower, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Thomas Marent / Apricot Sulphur (Phoebis argante) butterflies, Santa Maria, Colombia

Heidi & Hans-Juergen Koch / Pierid Butterfly (Phoebis sp), native to Peru

Ingo Arndt / Pupa of Cloudless sulphur butterfly (Phoebis sennae)

Ingo Arndt / Pupa of Apricot sulphur butterfly (Phoebis argante)

Nick Hawkins / Orange-barred sulphur butterfly (Phoebis philea) pe. Costa Rica

Nick Hawkins / Cloudless sulphur butterfly (Phoebis sennae) photographed on white. Costa Rica, March.

Roger Powell / Cloudless sulphur butterfly (Phoebis sennae) feeding on nectar from a thistle flower head, Cedar Key, Levy County, Florida, USA, April

Tui De Roy / Galapagos sulphur butterfly (Phoebis sennae marcellina) feeding from Opuntia (Opuntia sp) cactus flower with endemic Carpenter bee (Xylocopa darwinii) Alcedo Volcano, Isabela Island, Galapagos, Ecuado...

Pete Oxford / Sulfur Butterflies (Phoebis sp. ) puddling on mineral lick, Yasuni National Park, Amazon Rainforest, Ecuador, South America.

Stephen Dalton / Barred sulphur butterfly (Phoebis philea) Florida, USA, February.

Konrad Wothe / Butterflies (Phoebis sp) puddling near Tambopata river, Tambopata National Reserve, Peru, South America.

Stephen Dalton / Orange barred sulphur (Phoebis philea) in flight, controlled conditions, from the Caribbean

Pete Oxford / Pierid Butterfly (Phoebis sp) group on mineral lick, Yasuni National Park, Amazon, Ecuador

Pete Oxford / Pierid Butterfly (Phoebis sp) group on mineral lick, Yasuni National Park, Amazon, Ecuador

Mark Moffett / Pierid Butterfly (Phoebis sp) feeding on sunflower nectar, Sonoita, Arizona

Konrad Wothe / Orange-barred Sulphur (Phoebis philea) feeding on flower nectar, native to South America

Murray Cooper / Pierid Butterfly (Phoebis sp) group puddling on wet soil to extract minerals, Amazon, Ecuador

Thomas Marent / Cloudless Sulphur (Phoebis sennae) butterfly, Colombia

Thomas Marent / Cloudless Sulphur (Phoebis sennae) chrysalis, Colombia

Thomas Marent / Pierid Butterfly (Phoebis sp), Manu National Park, Peru

PREMAPHOTOS / Sulphur butterfly (Phoebis rurina) puddling / drinking from damp ground in tropical dry forest, Costa Rica

Steven David Miller / Cloudless sulphur butterfly (Phoebis sennae) captive, USA

Ingo Arndt / Cloudless Sulphur butterfly (Phoebis sennae) emerging from chrysalis, Costa Rica

Philippe Clement / Orange-barred Sulphur butterfly {Phoebis philea} on leaf, Costa Rica.

Pete Oxford / Giant sulphur butterflies (Phoebis sp.) at salt lick. Madre de Dios river, Amazonia, Peru, Southern Africa

Suzi Eszterhas / Pierid Butterfly (Phoebis sp) group feeding on salts and minerals in soil, Amazon, Brazil

Christian Ziegler / Left to right, from top: Blue Helicopter Damselfly (Megaloprepus coerulatus), Mydas Fly (Mydidae), Saw-nosed Planthopper (Cathedra serrata), Metalmark (Lymnas pixe), Grasshopper (Proscopia panamensis)...

Adrian Davies / Straight-lined sulphur butterfly (Phoebis trite) male, in visible light, top, and reflected Ultraviolet light, bottom. Pinned specimen.

Claudio Contreras / Large orange sulphur butterfly (Phoebis agarithe) on leaf. Tamaulipas state, Mexico.

Lynn M. Stone / Cloudless sulphur butterfly (Phoebis sennae) nectaring on Zinnia. Connecticut, USA. August.