Franco Banfi / Pygmy blue whale (Balaenoptera musculus brevicauda) subspecies of blue whale, Mirissa, Sri Lanka, Indian Ocean. Endangered species.

Franco Banfi / Pygmy blue whale (Balaenoptera musculus brevicauda) subspecies of blue whale, Mirissa, Sri Lanka, Indian Ocean. Endangered species.

Martin Willis / Sulphur-crested Cockatoo (Cacatua galerita) displaying with crest erected, Brisbane, Queensland, Australia

Martin Willis / Sulphur-crested Cockatoo (Cacatua galerita) flying, Magnetic Island, Queensland, Australia

Robert Thompson / Owlfly sulphur (Libelloides coccajus) on flower, near Gavarnie, Pyrenees National Park, France, June.

Jan Wegener / Sulphur-crested Cockatoo (Cacatua galerita), Victoria, Australia

Claudio Contreras / Keel billed toucan (Ramphastos sulfuratus) calling, captive.

Claudio Contreras / Keel billed toucan (Ramphastos sulfuratus), captive.

Bence Mate / Keel billed toucan (Ramphastos sulfuratus) in aggressive encounter with Montezuma Oropendola (Psarocolius montezuma) in rain, Laguna del Lagarto, Santa Rita, Costa Rica. Front cover bookplate of the H...

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...

Mark Taylor / Men working the sulphur mine at Kawah Ijen, Java, Indonesia. No release available.

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...