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David Attenborough re puzzling over the Loch Ness Monster with Sir Peter Scott.
The naturalist recalls finding an ammonite inside limestone, sparking his love of fossils.
Looking at why underground animals have evolved differently from those on the surface.
Musings on the New Guinea residents, who fooled early explorers with their adornments.
Musings on the structures built by New Guinea's Vogelkop bowerbirds to attract mates.