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
Mountain Chickadee: Identification, Call, Nest and Facts
July 19, 2026
The Mountain Chickadee is a small, active songbird of western North America’s high-elevation forests. Its black cap, white cheeks, gray body, and distinctive white eyebrow
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Carolina Chickadee: Identification, Song, Nest and Facts
July 19, 2026
The Carolina Chickadee is a tiny, energetic songbird recognized by its black cap, white cheeks, gray back, and cheerful calls. A permanent resident of the
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What Do Black-Capped Chickadees Eat? 10 Favorite Foods
July 18, 2026
Black-capped Chickadees eat insects, spiders, seeds, nuts, berries, mealworms, and other energy-rich foods. Their diet changes throughout the year. During spring, summer, and fall, they
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Female Black-Capped Chickadee: Male vs Female Differences
July 18, 2026
A female Black-capped Chickadee is a tiny, energetic songbird with a black cap, dark throat, white cheeks, gray back, and soft buff-colored sides. However, identifying
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Black-Capped Chickadee Eggs: Color, Size and Hatching
July 16, 2026
Black-capped Chickadee eggs are tiny, white eggs decorated with fine reddish-brown dots or spots. The female usually lays them inside a soft, well-hidden nest built
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Carolina Chickadee vs Black-Capped Chickadee: ID Guide
July 16, 2026
The Carolina Chickadee and Black-capped Chickadee are remarkably similar birds. Both have black caps, black throat patches, white cheeks, gray backs, and energetic feeding behavior.
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Black-Capped Chickadee Nest: Habits, Eggs and Nest Boxes
July 15, 2026
A Black-capped Chickadee nest is usually hidden inside a small tree cavity, rotten branch, old woodpecker hole, or properly designed nest box. Although the nest
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Black-Capped Chickadee: Calls, Diet, Habitat and Facts
July 15, 2026
The Black-capped Chickadee is a tiny, energetic songbird known for its bold black cap, bright white cheeks, and familiar “chick-a-dee-dee-dee” call. Common across much of
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13 Types of Small Long-Beaked Birds: Identification with Pictures
July 14, 2026
Small long-beaked birds are fascinating species found in gardens, forests, mountains, wetlands, and tropical regions around the world. Their slender or curved bills help them
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20 Common Types of Small Blue Birds: Identification with Pictures
July 14, 2026
Small blue birds are among the most attractive and fascinating birds found in forests, gardens, grasslands, mountains, and wetlands worldwide. Their colorful feathers range from
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