Animals & Nature
The fastest, largest, longest-lived and strangest of the living world, ranked on measured biology.
26 lists in this topic.
Top 10 Animals by Number of Neurons in the World
The ten animals with the most neurons in the whole brain, among species with published counts or estimates, from the African elephant (257 billion) to the rhesus macaque (6.376 billion).
animalsTop 10 Birds by Wingspan
The ten living flying birds with the largest published wingspans, from the great albatrosses and pelicans to the Andean condor and marabou stork.
animalsTop 10 Deadliest Snakes by Venom Potency (LD50)
The ten snakes with the most potent venom by subcutaneous LD50 in mice, in saline: from the inland taipan's 0.025 mg/kg to the mainland tiger snake's 0.118 mg/kg.
animalsTop 10 Heaviest Animals
The ten heaviest living animals are all whales, ranked by average adult body mass in metric tonnes, from the 110-tonne blue whale down to the gray whale.
animalsTop 10 Heaviest Snakes in the World by Body Weight
On weights that are actually on record, a captive Burmese python named Baby (182.8 kg) is the heaviest snake. The green anaconda's best reliable figure is 97.5 kg, the heaviest of 780 wild snakes in one study, and heavier anaconda claims have never been firmly verified.
animalsTop 10 Largest Amphibians in the World by Maximum Length
The longest amphibian species on record, ranked by maximum reported total length: three giant salamanders, two caecilians, two amphiumas, two sirens and the hellbender.
sea-lifeTop 10 Largest Bony Fish by Maximum Weight in the World
The ten heaviest bony fish species, ranked by the maximum published weight in FishBase: sturgeons, ocean sunfishes, marlins, bluefin tuna and swordfish.
animalsTop 11 Largest Reptiles in the World by Maximum Length
By total length, the longest reptile on record is a reticulated python measured at 7.92 m. The longest crocodilian is a Nile crocodile at 6.45 m, and a tie at the bottom puts 11 species on this top 10.
animalsTop 10 Longest-Living Animals by Maximum Lifespan (Excluding Sponges and Corals)
The oldest ages recorded for individual animals, from a 507-year-old ocean quahog clam to a deep-sea tubeworm of 170-plus years. Sponges and corals, which can be far older, are excluded as modular or colonial animals.
animalsTop 10 Longest-Living Vertebrates by Maximum Lifespan
A Greenland shark dated to 272-512 years old (midpoint 392) makes it the longest-lived vertebrate known. The bowhead whale is next at an estimated 211 years and the rougheye rockfish at 205.
animalsTop 11 Longest Snakes by Maximum Length in the World
The reticulated python is the world's longest snake. Its longest recorded length is 7.92 m, for a captive python named Samantha, and the green anaconda's is 6.32 m. Two ties at the bottom put 11 species on this top 10.
breedsTop 10 Most Popular Cat Breeds by CFA Registrations
The ten most popular pedigreed cat breeds in the Cat Fanciers' Association's 2026 ranking, based on kittens registered with CFA in 2025, led by the Maine Coon for the second year running.
plantsTop 10 Oldest Individual Trees by Verified Age in the World
Prometheus, a bristlecone pine cut down in 1964, had at least 4,862 rings. Methuselah, at 4,669 years, is the oldest known living non-clonal tree.
animalsTop 10 Largest Whitetail Deer by Boone and Crockett Score in North America
The ten highest-scoring typical whitetail bucks in the Boone and Crockett Club's records, led by Milo Hanson's 213-5/8-point Saskatchewan world record.
insectsTop 10 Biggest Spiders by Leg Span
The ten largest spiders in the world measured leg tip to leg tip, from a cave-dwelling huntsman the width of a ruler down to a dune spider the size of a saucer.
sea-lifeTop 10 Largest Whales by Maximum Recorded Length
The ten longest whale species on Earth, ranked by the maximum body length NOAA Fisheries reports for each.
animalsTop 10 Biggest Cats by Average Adult Body Mass in the World
Tigers hold the heaviest-cat record, but on typical adult male weight the lion edges ahead — and the top ten runs all the way down to the bobcat.
animalsTop 10 Fastest Land Animals by Top Speed in the World
From the cheetah's 112 km/h sprint to the coyote's 69 km/h chase, these are the ten fastest land animals on Earth by documented top speed.
animalsTop 10 Largest Land Animals by Body Weight in the World
From the six-tonne African bush elephant down, the ten heaviest land animals alive today ranked by average adult body mass.
sea-lifeTop 10 Heaviest IGFA All-Tackle World Record Fish by Certified Weight of All Time
The ten heaviest fish ever certified as an IGFA all-tackle world record, ranked by weight.
dinosaursTop 10 Largest Dinosaurs by Estimated Body Length
The ten longest dinosaurs that ever lived, ranked by estimated maximum body length — from the colossal Argentinosaurus down to Diplodocus.
animalsTop 10 Fastest Birds by Flight Speed
The 10 fastest birds on Earth ranked by maximum recorded airspeed, from the 242 mph peregrine falcon to the 81 mph red-breasted merganser.
sea-lifeTop 10 Largest Sharks by Maximum Length
The ten longest shark species on Earth, ranked by the largest individual each has ever had reliably measured.
breedsTop 10 Most Popular Dog Breeds by AKC Registrations in the United States
The French Bulldog holds the AKC's top spot for a fourth straight year as the most-registered breed in America.
plantsTop 10 Tallest Tree Species by Maximum Recorded Height
The ten tree species with the tallest individual ever reliably measured, from the 116-meter coast redwood down to the towering firs of the Pacific Northwest.
animalsTop 10 Fastest Animals
The ten fastest animals on Earth ranked by their maximum recorded speed in kilometres per hour, across air, land, and water.