extinction

Human arrival in New Zealand led to the extinction of one penguin species to the advantage of another, scientists suggest.

About 25% of the world's mammal species are at risk of extinction, according to a global assessment.

The extinction of many ancient species may be due to humans rather than climate change, experts say.

Ten areas of Scotland are identified as frontlines in the fight to save rare insects from extinction.

One-third of the world's reef-building coral species are facing extinction, the first global assessment shows.

More than half of the world's ocean-going sharks are at risk of extinction, says the world's official conservation agency.

A UK mountain-dwelling butterfly could be wiped out in Scotland because of climate change, experts say.

Polar bears in Canada are at risk from climate change but not threatened by extinction, a panel of experts say.

The scalloped hammerhead shark is being pushed towards the brink of extinction, say experts.

Canadian wild salmon are being driven to extinction by outbreaks of parasites from fish farms, a study claims.