There are a total of 479 Big animals that have been compiled and organized in this comprehensive list. The selection includes species defined as “big” by typical adult mass or length, covering large mammals, birds, reptiles, and fish, and excluding most invertebrates unless unambiguously gigantic.

Big animals are species notable for large adult body size, measured by mass, length, or both. They range from land giants like elephants and giraffes to ocean giants like blue whales, plus large birds and reptiles. They shape ecosystems through grazing, predation, nutrient cycling, and physical alteration of habitats. They are central to conservation, education, and many cultural traditions worldwide.

Interesting and little-known facts about Big animals:
– The blue whale is the largest animal, reaching about 30 m in length and up to 150,000 kg in mass.
– An adult African elephant can weigh up to about 6,000 kg and eat 150–300 kg of vegetation per day.
– The giraffe is the tallest land animal, commonly reaching 4.5–5.5 m, with males sometimes taller.
– Saltwater crocodiles can exceed 6 m in length and 1,000 kg, making them the largest living reptiles.
– Ostriches are the heaviest living birds, growing to about 2.8 m and up to roughly 150 kg.

The alphabetical index links to one letter per page, with each entry summarized in a compact table. Columns include common name, scientific name, primary habitat (biome and region), typical adult size (mass or length), and typical wild lifespan (years).