60 Fun Facts About Hard Nature

Humans have four types of photoreceptor cell. How many does a mantis shrimp have?

Their clubs also strike with an acceleration of about 10,400 g, fast enough to boil the water around them into cavitation bubbles.

To what temperature does the air around a lightning flash heat?

Earth sees roughly 44 flashes every second, close to 1.4 billion a year.

Tardigrades in their dormant state have survived temperatures as low as what?

That is a single degree above absolute zero; they have also survived the vacuum and radiation of open space.

Who first described tardigrades in 1773, calling them "little water bear"?

Spallanzani supplied the name Tardigrada, meaning slow walkers, three years later.

How old was Methuselah, the bristlecone pine in California's White Mountains, in 2025?

At 4,858 years in 2025 it is the oldest known living non-clonal organism, already ancient when Stonehenge was finished.

Pando, the quaking aspen clone in Utah's Fishlake National Forest, has roughly how many stems?

Every stem is genetically identical and shares one root system covering about 43 hectares.

Oregon's Armillaria ostoyae "humongous fungus" covers about how much ground?

It may weigh 35,000 tons, making it a candidate for the largest living organism by mass, area and volume.

Which desert plant grows only two leaves in its entire life, which can last over a thousand years?

The two leaves keep growing from a woody crown and shred into ribbons in the Namib wind.

Wolffia microscopica, the fastest-growing flowering plant, doubles in about how long?

Wolffia are the watermeals, the smallest flowering plants on Earth, resembling specks of cornmeal on a pond.

A Venus flytrap shuts fully only if a second trigger hair is touched within about how long?

The double-touch rule stops the plant wasting energy closing on raindrops and debris.

Lake Baikal, 1,642 m deep, holds roughly what share of the world's fresh surface water?

That is more than all the North American Great Lakes combined, and at 25–30 million years old it is also the oldest lake.

What is the maximum known depth of the Challenger Deep in the Mariana Trench?

Its floor is more than 2 km farther from sea level than the summit of Everest is above it.

Angel Falls in Venezuela, the tallest uninterrupted waterfall, has a total height of what?

The main plunge alone is 807 m; the Pemon name for the falls is Kerepakupai Vená.

In 2025, the surface of the Dead Sea sat roughly how far below sea level?

Its 34% salinity makes it about 9.6 times saltier than the ocean, so swimmers simply float; the level keeps falling about a metre a year.

The Caspian Sea, the largest inland body of water, has a salinity of about what?

That is roughly a third of average seawater, which is why it is argued over as both a lake and a sea.

Which Meghalaya village is reportedly the wettest place on Earth, with about 11,872 mm of rain a year?

It sits just 15 km west of Cherrapunji, the place that used to hold the title in every schoolbook.

Earth's lowest reliably measured temperature, −89.2 °C, was recorded at which Antarctic base?

The Soviet-founded station sits at the southern Pole of Cold and gets zero hours of sunshine in polar night months.

On what date was the record 134 °F (56.7 °C) air temperature measured at Furnace Creek, Death Valley?

The highest reliable modern reading there is 130 °F, hit in both 2020 and 2021.

The Atacama Desert averages roughly how much rain per year?

It sits in a two-sided rain shadow between the Andes and the Chilean Coast Range, and some stations there have never recorded rain.

The most recent Yellowstone supereruption, which created the present caldera, was how long ago?

It produced the Lava Creek Tuff; the first and largest cycle, 2.08 million years ago, formed the Island Park Caldera.

Old Faithful erupts on average about every how many minutes?

It was named in 1870 by the Washburn–Langford–Doane Expedition and was the first geyser in Yellowstone to get a name.

Which island emerged in 1927 from the caldera left by the 1883 eruption in the Sunda Strait?

The name means Child of Krakatoa; Rakata is the only surviving remnant of the original island.

Everest's height was remeasured in 2020 by a joint Nepalese–Chinese survey. What figure did they publish?

Tenzing Norgay and Edmund Hillary made the first documented ascent in 1953 via the Southeast Ridge.

Roughly how many individual trees are estimated to stand in the Amazon rainforest?

They belong to about 16,000 species, and 60% of the forest lies in Brazil.

The Sahara is the largest hot desert, but only the third-largest desert overall. Which two are bigger?

A desert is defined by precipitation, not heat, and the polar regions get very little.

Which animal produces the loudest sound of any creature, with clicks reaching 236 decibels underwater?

It also has the largest brain on Earth, more than five times heavier than a human's.

The heart of a stranded North Atlantic blue whale, the largest known in any animal, weighed how much?

The animal itself can reach about 30 m and 190–200 tonnes on a diet almost entirely of krill.

The colossal squid's eyes, the largest of any known creature, measure at least what across?

It is also the largest living invertebrate at 495 kg confirmed, and it is the only cranchiid squid with hooks on its arms and tentacles.

Greenland sharks reach sexual maturity at roughly what age?

The oldest individual was estimated at 392 years, plus or minus 120, making it the longest-lived vertebrate known.

Which mammal may be the longest-lived of all, with individuals exceeding 200 years?

Old stone harpoon points have been recovered from living bowheads, backing up the age estimates.

The "immortal jellyfish" Turritopsis dohrnii is named for the founder of a zoological station in which city?

It can revert from a sexually mature medusa back to a polyp colony, effectively restarting its life cycle.

The first living coelacanth was described from specimens caught off which country from 1938?

They are now known around the Comoro Islands too, and a second species turned up in Indonesian waters decades later.

Horseshoe crab blood is harvested for Limulus amebocyte lysate, which is used to detect what?

Only four species survive today, and their blue, copper-based blood is worth thousands of dollars a litre to the pharmaceutical industry.

Electric eels can deliver shocks of up to how many volts?

Despite the name they are knifefish, not true eels, and Linnaeus first described them in 1766.

How many eyes does a box jellyfish have in total?

Six sit on each of its four rhopalia, and unlike most jellyfish they are true eyes with lenses, corneas and retinas.

Which snake is widely regarded as the world's most venomous by LD50?

It lives in semi-arid central-eastern Australia and is known to Karnic-speaking Aboriginal Australians as dandarabilla.

Of over 170 poison dart frog species, how many are documented as used to poison darts?

All belong to the genus Phyllobates; most indigenous South American darts used curare plants instead.

Bombardier beetles make their boiling defensive spray by reacting hydrogen peroxide with what?

Catalysts in a chamber the entomologist Thomas Eisner called the vestibule set off the reaction with an audible pop.

Which Nobel laureate first decoded the honeybee waggle dance?

Bees switch from a round dance to a waggle dance once the food source is more than about 40 metres from the hive.

Which bird's migration from Alaska to New Zealand is the longest known non-stop flight of any bird?

It is also the longest journey without pausing to feed by any animal, made by the subspecies baueri.

Arctic terns nesting in Iceland and Greenland average round trips of roughly what distance each year?

One Farne Islands bird logged 96,000 km in ten months; the species sees two summers every year.

Emperor penguins can dive to about what depth while hunting?

They can stay under for around 20 minutes, coping with pressure up to 40 times that at the surface.

Male bee hummingbirds, the smallest birds alive, weigh on average how much?

They are native to Cuba and can eat half their body weight in a day.

Which is the world's only flightless parrot and also its heaviest?

It is nocturnal, endemic to New Zealand and one of the very few birds that breed in a lek system.

Which South American bird has a fermenting, ruminant-like digestive system and clawed chicks?

The fermenting crop gives it a manure-like smell, hence the nickname stinkbird.

Around 70–80% of a male superb lyrebird's vocalisations are what?

Mostly other birds, though it will occasionally impersonate a marsupial.

Which mammal has a gestation of around 22 months, the longest of any mammal?

Its trunk ends in two finger-like processes, one more than an Asian elephant's.

Only two mammals are known to be eusocial. One is the naked mole-rat; which species is the other?

That is the Damaraland mole-rat, a close relative. Naked mole-rats are also the only mammals that essentially do not regulate their own body temperature.

The aye-aye finds grubs by tapping on trees and listening for hollows. What is this method called?

It then gnaws a hole and fishes the grub out with a thin, elongated middle finger.

Sloths are unusual among mammals for not having how many neck vertebrae?

Nearly every other mammal, giraffe included, has exactly seven; sloths break the rule in both directions depending on the genus.

Which animal produces cube-shaped dung?

The cubes are thought to help the droppings stay put where they are placed to mark territory.

Male platypuses carry venom in a spur located where?

Females are born with the spurs too but lose them, and the platypus also hunts by electrolocation with its eyes, ears and nostrils shut.

Which is the most trafficked mammal in the world?

They are taken for meat and for their keratin scales, which are used in traditional medicine.

Which writer used the term "aurora" in his extensive writings about the phenomenon in 1619?

Auroras are caused by solar wind disturbing the magnetosphere; excited oxygen and nitrogen emit the green, red and purple light.

Which fish can produce up to 300 million eggs at a time, more than any other known vertebrate?

Mola mola females release their eggs into open water for external fertilisation; spawning grounds are suggested in every ocean.

How long is the axolotl genome sequenced in 2018, then the largest animal genome ever completed?

At 32 billion base pairs, roughly ten times the human genome, it revealed pathways that may drive limb regeneration.

The word 'axolotl' comes from Nahuatl and refers to which Aztec god?

Translations range from 'water dog' to 'water monstrosity'; Xolotl was the god of fire and lightning.

How does a stooping peregrine falcon strike a bird so as not to injure itself on impact?

The falcon clips one wing of the bird after a steep high-speed dive; third eyelids clear its eyes during the stoop.

On what date was the peregrine falcon removed from the US Endangered Species list?

DDT restrictions let released birds breed successfully, and the species was delisted on 25 August 1999.

Which French explorer was the first European to find a Rafflesia, in 1797, while detained on Java?

Deschamps was held three years by the Dutch; Joseph Arnold's 1818 Sumatran specimen gave R. arnoldii its name.