All articles

Everything on The Fauna Archive, organised by topic.

Animal Behavior

Animals That Mate for Life: 12 Species That Pair Bond — Animals that mate for life include gray wolves, beavers, gibbons, prairie voles, bald eagles, mute swans, Laysan albatrosses, sandhill cranes, black…
Why Do Animals Make Sounds? 7 Main Reasons — Animals make sounds to attract mates, defend space, warn of danger, maintain contact, identify parents or young, coordinate group activity, and locate…

How Do Dolphins Sleep Without Drowning? — Dolphins sleep by resting one brain hemisphere at a time, a pattern called unihemispheric sleep.
How Long Do Sea Turtles Live? Lifespan of All 7 Species — Sea turtles live roughly 30 to 70 years or more, depending on the species.
Marine Invertebrates Examples: Recognize the Main Groups — Marine invertebrates are sea animals without a backbone. Familiar examples fall into six main groups: sponges; cnidarians such as jellyfish, sea anemones…
Why Do Octopuses Have Three Hearts? — Octopuses have three hearts with different jobs: two branchial hearts send blood through the gills, while one systemic heart pumps oxygenated blood around…

How Fast Can a Cheetah Run? Top Speed and Sprint Facts — A cheetah can reach roughly 60 mph in a short sprint. Wild tracking research recorded 58 mph, while Cincinnati Zoo reported a 61 mph maximum for Sarah.
How Long Do Elephants Live? An Honest Range — Elephants can reach their 50s, and a small number live longer, but a simple 60–70-year average is too confident.
What Makes an Animal a Mammal? The 3 Traits That Count — An animal is a mammal if it has three traits no other living animal shares: hair at some stage of life, mammary glands that make milk for its young, and…
What Do Foxes Eat? Diet by Season, Habitat, and Species — Foxes are opportunistic omnivores. Their core diet is small mammals — especially voles, mice, and rabbits — supplemented with birds and eggs, insects,…