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Note: These lists & the resulting counts don't include normal animal or plant species, whether native to present-day Earth or not. Thus, for example, pteranodons & oak trees aren't included, nor are the flora & fauna of other planets.

Counting only appearances in Doctor Who itself:

Count: 17 to 19, depending on whether Yeti & Autons are included.

Adding appearances in televised spin-offs:

This adds 5 to 10, depending on whether or not those that have never appeared in Doctor Who itself are included, giving a count of 22 to 29.