Lost land of the volcano

The crater of the extinct volcano Mount Bosavi, on the New Guinea mainland Photograph: Ulla Lohmann/BBC

The beautiful fruit dove Photograph: Ulla Lohmann/BBC

A buff-faced pygmy parrot, found by bird expert Jack Dumbacher Photograph: Ulla Lohmann/BBC

A hairy caterpillar found in the rainforest Photograph: Ulla Lohmann/BBC

The Bosavi woolly rat had no fear of humans when it was discovered
Photograph: Jonny Keeling/BBC

A jungle spider camouflaged as lichen. There are thought to be more than 5m species of insect and spiders yet to be found in the world's jungles Photograph: Ulla Lohmann/BBC

An iridescent beetle found in the rainforest Photograph: Ulla Lohmann/BBC

Common tube-nosed bat found by expert Alanna Maltby Photograph: Ulla Lohmann/BBC

The endangered Litoria sauroni amphibian Photograph: Ulla Lohmann/BBC

The Bosavi silky cuscus mammal Photograph: Jonny Keeling/BBC

The king bird of paradise. Biologist Jack Dumbacher caught one as part of his study into the diseases held in the rainforest Photograph: Ulla Lohmann/BBC

The emerald green disc on the tail feather of the king bird of paradise which are used in a courtship ritual Photograph: Ulla Lohmann/BBC

A striped possum, found by Muse Opiang and Gordon Buchanan, an animal which lets out a strong odour as a defence mechanism Photograph: Ulla Lohmann/BBC

The black and yellow noctuid caterpillars found by George McGavin. When the caterpillars sit together like this they resemble a small snake, possibly as a defence strategy Photograph: Ulla Lohmann/BBC

Opening to Mageni cave, New Britain, Papua New Guinea Photograph: Jonny Keeling/BBC