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Quantifying (or apply a number) extinct species is a daunting task if you're looking for a "historical" figure. Secondly, we have to consider if "animals" are mammals, avian, reptilian, amphibian, aquatic, or a combination of all of the above. Then we need to look at the age, era, or epoch in question. For example, it's well known that all of the dinosaur species went extinct and, to date, we know that means around 700 species.

Doing a quick search on the IUCN database for extinct Animalia, the database reports 712 results. Granted, this is going to be current era species only and only those with the Animalia taxonomy.

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13y ago

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