'Spineless' animals under threat of extinction

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A fifth of animals without backbones could be at risk of extinction, say scientists.

Almost 80% of the world's species are invertebrates, meaning they lack a

spinal column.

Reviewing over 12,000 species known to be threatened, biologists found that

freshwater ones are most at risk.

Researchers urged for comprehensive studies of those vulnerable, to help

inform conservation and protect species.