EXTINCTION sunday briefing sunday briefing While the disappearance of species such as tigers and mountain gorillas grabs the headlines and fills TV schedules, less well-known is the fact that we appear to be living through an extinction event bigger than that which wiped out the dinosaurs. This assault on biodiversity is seen by many scientists as a greater threat to mankind than climate change.

From: The Sunday Herald | Date: December 10, 2006 | Copyright information

WHAT DIED OUT WHEN

THERE have been at least five mass extinctions in the world history, and four in the past 3.5 billion years in which many species have disappeared in a relatively short period of geological time. The most recent of these, 65 million years ago at the end of the cretaceous period, is best known for having wiped out the dinosaurs, among many other species.

488 MILLION YEARS AGO

A series of mass extinctions eliminated many brachiopods (clam- like creatures) and conodonts (a type of toothed worm) and severely reduced the number of trilobite species (pictured below). These ...

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