Dec 9, 2025 · Animal, any of a group of multicellular eukaryotic organisms thought to have evolved independently from the unicellular eukaryotes. Animals differ from other multicellular eukaryotes, the …

Animal body lengths range from 8.5 μm (0.00033 in) to 33.6 m (110 ft). They have complex ecologies and interactions with each other and their environments, forming intricate food webs.

Learn about some of nature’s most incredible species through recent discoveries and groundbreaking studies on animal habitats, behaviors, and unique adaptations.

The world’s largest & most trusted collection of animal facts, pictures and more! Discover more than 1,000 new animals today!

From reptiles and amphibians to fish, birds and mammals, meet the animals at the Smithsonian's National Zoo and Conservation Biology Institute.

ANIMAL definition: any member of the kingdom Animalia, comprising multicellular organisms that have a well-defined shape and usually limited growth, can move voluntarily, actively acquire food and digest …

May 26, 2023 · Scroll down (or click the image above) to see a complete guide to animals and the animal kingdom. Find out: what makes an animal an animal; how animals are classified; …

Welcome to Animalia, an online animal encyclopedia where you can learn about all your favourite animals, and even some you may have never heard of.

Dec 31, 2024 · Explore the animal kingdom with detailed scientific guides, species characteristics, behaviors, habitats, and interactive resources for comprehensive learning and discovery

The common animals most people know are only about 3% of the animal kingdom. When biologists look at animals, they find things that certain animals have in common.