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...

Tui De Roy / Volcan Alcedo giant tortoises (Chelonoidis nigra vandenburghi) wallowing in rain pools on caldera floor, possibly for thermoregulation or detering parasites, with sulphur fumaroles in background, Alce...

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.

Michel Poinsignon / Berger's Clouded Yellow Butterfly (Colias alfacariensis) pair mating, Ottange, Lorraine, France, October.

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

Tui De Roy / Volcan Alcedo giant tortoise (Chelonoidis nigra vandenburghi) group in muddy stream, possibly for thermoregulation or to deter parasites, with sulphur fumaroles from Alcedo Volcanos slopes, Isabela is...