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making pieces of eight go furtherMeasuring biodiversity falls into the really-important-but-incredibly-difficult-to-do category of chores, so when someone comes up with a scheme to make it more cost-effective (i.e. easier) they deserve to be heard. A lengthy list of international conservation biologists, fronted by the University of East Anglia's Toby Gardner, has done just that, and just they've published their findings in Ecology Letters. After sampling a wide range of taxa at sites across 500 000 hectares of Brazilian Amazonia, birds and dung beetles shook out as being particularly good - and cheap - indicators of general biodiversity. However, focusing on these groups is a double-edged sword: on the one hand the money goes further, but on the other we remain ignorant of those poorly understood, expensive to study species.

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