Animal Groups and Number of Species
Here are 10 major animal groups with an approximate number of known species in each:
- Mammals – ~6,500 species
- Birds – ~11,000 species
- Reptiles – ~11,500 species
- Amphibians – ~8,000 species
- Fish – ~34,000 species
- Insects – ~1,000,000+ species
- Arachnids (spiders, scorpions, etc.) – ~100,000 species
- Mollusks (snails, clams, squids) – ~85,000 species
Common Vampire Bat: Facts, Behavior, and Survival
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The common vampire bat is one of the most unusual mammals in the world. Known for feeding on blood, this small bat has inspired myths,
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13 Types of Hedgehogs: Different Species Identification
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Hedgehogs are small spiny mammals found in Europe, Africa, and parts of Asia. Although they may look similar at first, each species has unique features,
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Mountain Weasel: Facts, Habitat, Diet and Genshin Guide
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The mountain weasel is a small, agile predator found in cold and high-altitude regions of Asia. Also known as the Altai weasel, pale weasel, or
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25 Types of Chipmunks With Identification and Facts
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Chipmunks are small, striped rodents known for their quick movements, cheek pouches, and busy food-gathering habits. Different types of chipmunks live in forests, mountains, rocky
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14 Common Types of Gerbil: Species, Size, Habitat, Diet and More
June 14, 2026
Gerbils are small, active rodents known for their curious behavior, digging habits, and desert-adapted bodies. While the Mongolian gerbil is the most familiar pet species,
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Siberian Weasel: Diet, Habitat, Fur, Facts, and Behavior
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The Siberian weasel is a small but fierce carnivorous mammal known for its long body, quick movements, and golden-brown fur. Also called the kolonok, this
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Japanese Weasel: Facts, Diet, Habitat, and Mythology
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The Japanese weasel is a small, quick, and secretive carnivorous mammal native to Japan. Known in Japanese as “itachi,” this animal appears in wildlife guides,
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25 Types of Hamster: Different Species Identification With Pictures
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Hamsters come in many sizes, colors, and body shapes, from common pet breeds to rare wild species. Some are easy to recognize by their fluffy
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27 Common Types of Squirrels With Pictures
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Squirrels are small to medium-sized mammals found in forests, grasslands, parks, gardens, and even busy neighborhoods. They are known for their bushy tails, quick movements,
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Long-Tailed Weasel: Habitat, Diet, Size, and Facts
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The long-tailed weasel is a small but fierce predator known for its slender body, quick movements, long tail, and bold hunting style. Also called Mustela
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