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
23 Types of Shrew: Small Animal Species Identification
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Shrews are tiny, active mammals known for their pointed snouts, quick movements, and insect-eating habits. Although they may look like mice, shrews are not rodents.
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30 Common Types of Mouse: Different Species Id with Pictures
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Mice are among the most widespread and adaptable mammals on Earth, inhabiting environments ranging from dense forests and open grasslands to deserts and urban areas.
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Least Weasel: Lifecycle, Diet, Habitat, Size & Fascinating Facts
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The least weasel (Mustela nivalis) is the smallest carnivorous mammal in the world, yet it is one of nature’s most efficient hunters. Found across North
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Dragonfly: Habitat, Diet, Life Cycle, Lifespan, and Facts
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Dragonflies are among the most fascinating insects in the natural world. Known for their brilliant colors, large eyes, and incredible flying abilities, these ancient creatures
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Ladybug: Life Cycle, Habitat, Diet, Lifespan & Facts
June 4, 2026
Ladybugs are among the most recognizable and beneficial insects in the world. Known for their rounded bodies, bright colors, and distinctive spots, these small beetles
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Guppy Fish Care Guide: Types, Lifespan, Breeding & Tank Setup
June 3, 2026
Guppy fish are among the most popular freshwater aquarium fish in the world. Known for their vibrant colors, peaceful temperament, and easy care requirements, guppies
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Axolotl Guide: Lifespan, Care, Habitat & Tank Setup
June 2, 2026
The axolotl is one of the most fascinating aquatic animals in the world. Often called the “Mexican walking fish,” it is actually a salamander that
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Pygmy Marmoset Facts, Habitat, Diet, Lifespan, and Care
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The pygmy marmoset is the world’s smallest monkey and one of the most fascinating primates on Earth. Native to the Amazon rainforest, this tiny animal
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Tree Shrew Facts, Habitat, Diet, and Interesting Behavior
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Tree shrews are small mammals known for their fast movements, long snouts, and squirrel-like appearance. Despite their name, they are not true shrews and are
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Least Weasel Habitat, Diet, Lifespan, and Behavior Facts
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The least weasel is the smallest carnivorous mammal in the world and one of the most fascinating predators in nature. Despite its tiny body, this
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