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

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

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...

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

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

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

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

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