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Which group comprises the largest number of known animal species?

Mammals

Reptiles

Arthropods

The group that comprises the largest number of known animal species is arthropods. This category includes insects, arachnids (such as spiders and scorpions), crustaceans, and myriapods (like centipedes and millipedes). Arthropods are recognized for their diverse forms and adaptations, which enable them to thrive in virtually every environment on Earth.

The vast number of species within this group can be attributed to their high reproductive rates, ecological flexibility, and ability to occupy a wide range of habitats. For example, insects alone account for millions of species, making arthropods the most diverse group in the animal kingdom.

In contrast, mammals, reptiles, and amphibians have significantly fewer species when compared to arthropods, primarily due to their more specialized ecological niches and life histories. This highlights the incredible biodiversity seen within arthropods compared to other animal groups.

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Amphibians

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