When have the greatest numbers of the species' population been lost?

Question

About endangered species: the cheetah

Answer 1

I believe the K-T boundary event after the Jurrassic period that doomed the dinosaurs had the most extinctions just because sheer numbers, but the extended ice age at the end of the precambrian era took out 90% of all life at that time.

Answer 2

65 million years ago when a asteroid wiped out the dinosaurs.

then again we would not be here if it had not happened

Answer 3

A long time ago it wasn't looking too happy when the dinosaurs called it a day but we have managed without them.  Evolution is a useful device and over a long time new species come up to take their place.  In a million years time there won't be anything that we know now but plenty of other creatures.  In the short term it is sad if we lose lovely animals like cheetahs.

Later: Although badly written my answer was intended to agree with MPH below, that the period of the demise of the dinasaurs was when most species were lost.

Answer 4

the whale

Answer 5

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