Some scientists estimate around 2 million animal and plant species inhabit Earth. Others approximate around 8 million. Bug experts note there are probably some 5.5 million insects species alone. One recent analysis estimates tens of millions of animal species (this number is dominated by insects and tiny arthropods).
For centuries, biologists, ecologists, and taxonomists have documented critters around the globe. But, in a world teeming with biodiversity and remote ecosystems, they acknowledge there are plenty more species out there. The broad assumption is that humanity has named around 1.5 to 1.7 million plant and animal species, so far. Everything else is an educated guess. Read more...
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