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
Big Brown Bat vs Little Brown Bat: Key Differences
June 28, 2026
Big brown bats and little brown bats look similar at first because both are small, brown, nighttime insect hunters. However, they are different species with
Read more
What Do Little Brown Bats Eat? 10 Common Foods
June 28, 2026
Little brown bats are small nighttime hunters that eat insects almost entirely. They do not eat fruit, seeds, blood, or household food. Instead, they fly
Read more
Big Brown Bat: Facts, Size, Diet, Habitat and Behavior
June 27, 2026
The big brown bat is one of the most familiar bats in North America. Known for its sturdy body, broad wings, dark brown fur, and
Read more
Little Brown Bat: Size, Habitat, Diet, Lifespan & Facts
June 27, 2026
The little brown bat is one of North America’s most familiar bat species. Known scientifically as Myotis lucifugus, this small flying mammal is famous for
Read more
How to Take Care of a Hamster: Complete Care Guide
June 26, 2026
Hamsters are small, quiet, and fun to watch, but they still need daily care, safe housing, and gentle handling. A healthy hamster needs more than
Read more
Syrian Hamster Care: Cage, Diet, Lifespan and Facts
June 25, 2026
The Syrian hamster is one of the most popular pet hamsters because of its cute appearance, gentle personality, and easy daily care. Also called the
Read more
Jamaican Fruit Bat: Size, Diet, Habitat, and Facts
June 25, 2026
The Jamaican fruit bat is one of the most interesting fruit-eating bats in the Americas. Also called the Jamaican fruit-eating bat, this small mammal is
Read more
Little Red Flying Fox: Facts, Diet, Size, and Habitat
June 24, 2026
The little red flying fox is one of Australia’s most fascinating fruit bats. Despite its fox-like face and reddish fur, it is not a fox
Read more
Hamster Diet Guide: Best Foods, Chart and Tips
June 24, 2026
A healthy hamster diet should be balanced, simple, and consistent. Most pet hamsters do best with a quality hamster pellet or lab block as the
Read more
The Biggest Bats in the World: Giant Flying Foxes
June 23, 2026
The biggest bats in the world are not the tiny, fast-flying animals many people imagine when they think of bats. Most of the largest species
Read more