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.