



130 animals
Most Endangered Animals
Species fighting hardest for survival
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Tuesday, 28 July 2026Themed lists
Animals grouped by what makes them extraordinary — from the most endangered species to the fastest, biggest, and deadliest. A quick way to explore the guide by theme.
Fun facts
Sourced answer collections for high-curiosity queries — mate for life, colour change, bioluminescence, tool use, and more.
Surprising truths about how animals live, eat, and survive
10 factsSpecies known for long pair bonds and shared parenting
10 factsCamouflage, communication, and mood in living colour
10 factsBioluminescence and biofluorescence in land and sea
10 factsThanatosis and other last-resort defences
10 factsSpatial maps, social bonds, and years-long recall
10 factsSticks, stones, sponges, and solved problems
10 factsRecord-breaking journeys across sky, land, and sea
10 factsCurated




130 animals
Species fighting hardest for survival
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8 animals
Nature's most dangerous predators and defenders
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8 animals
The quickest movers on land, in air, and in water
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8 animals
The largest giants in the guide
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8 animals
The most intelligent minds in the wild
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19 animals
Life beneath and around the waves
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16 animals
The hunters at the top of the food chain
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8 animals
Winter sleepers and torpor specialists
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7 animals
Toxic if touched or eaten — not venomous bites
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7 animals
Champions of seasonal long-distance travel
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7 animals
Life in the ocean's midnight zone
View collectionIn depth
Data-backed articles on record-holders and extremes.
Ranked by estimated deaths per year — the answer isn't lions or sharks
Read guideBox jellyfish, inland taipan, blue-ringed octopus — and the venom vs poison distinction
Read guideSpecies on the very edge — some with fewer than 10 individuals remaining
Read guideGoliath birdeater by mass, giant huntsman by leg span — and which are actually dangerous
Read guideWhat IUCN Red List categories actually mean, with an example at each level
Read guideWhat 'nocturnal' really means — and the crepuscular animals (cats, rabbits) most lists get wrong
Read guideFrom a 507-year-old clam to a jellyfish that resets its age — ranked by lifespan
Read guideA 389 km/h falcon and the 110 km/h cheetah — ranked by top speed in km/h and mph
Read guideFrom the 6,000 kg elephant to the 540 kg moose — ranked by weight
Read guideFrom a 0.5 mg flea to a 100 mg wasp — the lightest animals ranked by weight
Read guide