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.

Dec 9, 2025 · animal, (kingdom Animalia), any of a group of multicellular eukaryotic organisms (i.e., as distinct from bacteria, their deoxyribonucleic acid, or DNA, is contained in a membrane-bound nucleus).

Mar 24, 2025 · Below you’ll discover the complete list of animal names our researchers have written about so far. With thousands more domesticated and wild animal lists planned, our goal is to become …

May 26, 2023 · An animal is a complex, multicellular organism that belongs to the biological kingdom Animalia – the animal kingdom. Animals range from relatively simple organisms such as sponges …

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

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

Aug 26, 2010 · The animal classification system characterizes animals based on their anatomy, features of embryological development, and genetic makeup. Scientists are faced with the task of classifying …

Each of our animal facts pages covers a range of topics about that animal, including their diet, habitat, breeding patterns, their physical characteristics, unique personality traits and behaviors and much …

The Smithsonian's National Zoo is home to more than 2,200 animals representing almost 400 different species. Learn more about animals, exhibits, conservation and education at the Zoo!

Although scientifically humans are animals, in everyday usage, animal often refers to any member of the animal kingdom that is not a human being, and sometimes excludes insects (although including such …