Butterflies are in peril in the US as numbers of plummet by a third in the last ...

 - Two species of vertebrate, animals with a backbone, have gone extinct every year, on average, for the past century.

- Currently around 41 per cent of amphibian species and more than a quarter of mammals are threatened with extinction.

- There are an estimated 8.7 million plant and animal species on our planet and about 86 percent of land species and 91 percent of

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