Introduction
Extreme Nature is about some of the most intriguing, supernatural, out of the ordinary and extreme plants and animals on the planet. A fish that can change sex, a frog that gives birth through its mouth and a flower that smells so bad it makes people faint are in the motley collection of weird and wonderful creatures included in the book.
If proof were ever needed that fact really is stranger than fiction, then look no further than the natural world. Did you know, for example, that a bombardier beetle can blast a chemical spray that’s as hot as boiling water?
Are you aware that a castor bean produces a toxin 6,000 times more deadly than cyanide? And have you ever wondered about the three-toed sloth, which has just two modes of being: asleep and not quite asleep?
It would have been hard for a science fiction writer to dream up some of the most bizarre creatures and wacky behaviour described in this book. Imagine an animal that squirts up to a quarter of its own blood at its predators – that’s the Texas horned lizard. There is a frog that can withstand being frozen to –270°C (–454°F) and a moth with a 35cm (14in) tongue. A fish that can inflate itself to become a spine-covered sphere three times its original size may sound like a character from The Hitchhiker’s Guide to the Galaxy, but it really does exist, in tropical seas around the world, in the form of the pufferfish.
One of the richest environments for such peculiar and eccentric wildlife is the sea. This is where scientists first discovered the coelacanth, for example – a strange-looking fish that was thought to have gone extinct 65 million years ago, but is now known to be alive and well and living in the western Indian Ocean. The sea is where we first set eyes on a remarkable octopus that lives a life of deception, by disguising itself as anything from a flounder or a jellyfish to a sea snake. And in the cold, dark ocean depths scientists have found shrimp-like creatures thriving 11 km (6.8 miles) below sea level. But the sea is also the most unexplored region of the world and studying its wildlife can be about as difficult and challenging as exploring outer space. Even now, there are probably huge animals lurking beneath the ocean waves as yet unseen by human eyes – and untold numbers of smaller ones. But with the help of space-age research techniques and equipment, such as deep-sea submersibles and remote-access vehicles, we are just beginning to understand the true extent of alien-like life on our own planet.
There are more outlandish creatures to discover on land, too, though many of them are likely to be the natural world’s tiddlers and relatively hard to find. But the fact that we’ve already unearthed plants that eat animals, insects capable of walking on water and frogs with baggy skin just makes scientists determined to search for new species of plants and animals and ever-more extravagant forms of behaviour. It’s hard not to wonder what secrets have yet to be unravelled in the treetops, deep underground, in hidden corners of remote tropical rainforests, or under the glare of a microscope.
Extreme Nature was written with the invaluable help of over 150 such scientists working in all corners of the globe. With their generous assistance, in just a few sentences it’s been possible to summarise some of the highlights of many years, sometimes decades, of research. Thanks to them, if you’ve ever wondered which animal has the best colour vision, if a millipede really does have a thousand legs, how fast a falcon can swoop, or which is the world’s most dangerous snake, this is the place to look.
Any study of extreme nature is inevitably full of surprises, and when it comes to superlatives, there is always another record-breaker just around the corner. But while there’s little doubt that few of the records we’ve included are absolutes, in one way or another all animals and plants have something exceptional about them that deserves our attention. It’s certainly been enormous fun corresponding with so many experts in so many different fields and, with their guidance, making the final selection.
Ultimately, the aim of the book is simply to revel in these other-worldly creatures and their outlandish behaviour. We hope you enjoy being wowed by some of their exploits.
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Most explosive defence
NAME bombardier beetles Carabidae family
LOCATION on every continent except Antarctica
ABILITY mixing chemicals to create an explosion
In the world of insects, ants can overcome almost anything. But they don’t always have it their own way. Bombardier beetles deliver an anti-ant surprise that is positively explosive. An ant, a spider or any other predator that, say, clamps on to a beetle’s leg with hostile intent instantly finds itself blasted with a chemical spray that’s as hot as boiling water.
So how does a small, cold-blooded creature manage to do this? Pure chemistry: in the rear of its abdomen are two identical glands lying side by side and opening at the abdominal tip. Each has an inner chamber containing hydrogen peroxide and hydroquinones and an outer one with catalase and peroxidase. When chemicals in the inner chamber are forced through the outer one, the chemicals react together, and the beetle has effectively created a bomb.
The resulting vapour, now containing the irritants known as p-benzoquinones, explodes from the end of the abdomen with a bang that’s audible to a human and a temperature that’s scalding to the would-be predator. What’s more, the beetle can rotate its abdomen through 270 degrees in any direction, so that it can aim with absolute precision, and if 270 degrees isn’t enough, it can shoot over its back, hitting a pair of reflectors that will ricochet the spray at the extra angle needed. Scientists find bombardiers fascinating because they’re the only animals known to mix chemicals to create an explosion.
Most poisonous animal
NAME golden poison-dart frog Phyllobates terribilis LOCATION Pacific rainforests of Colombia, South America ABILITY producing the most deadly poison of any animal
This tiny frog uses toxic chemicals as a defence in its body and is therefore technically poisonous (venomous animals inject toxins via a weapon – a tail, fang, spine, spur or tooth). The toxin is effective only when the frog is attacked, and since the frog doesn’t want to be harmed, it sports a brilliant yellow or orange colour to warn predators of extreme danger.
In fact, this most poisonous of frogs is possibly the most poisonous animal in the world. The toxin is in its skin – you can die even by touching it – and there is enough in the skin of one animal to kill up to 100 people. Though the frog has been known to science only since 1978, inhabiting just one area in Colombia, the Chocó indians have known about it for generations, using its skin-gland secretions to poison their blowgun darts and kill animals in seconds.
The golden poison-dart frog gets most of its batrachotoxin (meaning frog poison) from other animals, probably small beetles, which in turn get it from plant sources. Captive-bred frogs, by comparison, never become toxic, presumably because they aren’t fed toxic insects. The frog is active in the day, having few predators except a snake, that has become immune to the toxin. Surprisingly, birds have been discovered in New Guinea with the same batrachotoxin in their skin and feathers. The likely link has been tracked down to a small beetle, similar to the New World beetles, which also contains batrachotoxins.
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Biggest blood-sucker
NAME Amazon leech Haementeria ghilianii
LOCATION Amazon basin
ABILITY drinking up to four times its weight in blood
No, the biggest blood-sucker isn’t a vampire bat. Vampires, which are native to the tropical Americas, don’t actually suck blood – they lap it up.
They find large mammals – most noticeably cows, pigs or horses – make a cut in their skin and then drink the blood. Not being very big (average body length is 6.5–9cm/2.5–3.5in), a single bat only actually consumes a few tablespoons of blood a night, though because of the anticoagulant in its saliva, the prey keeps bleeding for some time after the bat has flown away.
The world’s largest leech, measuring up to 46cm (18ins) does suck blood, however, and a very hungry one can take in four times its body weight before it becomes satiated. Since a large Amazon leech weighs about 50g (1.8oz) – the record is 80g (2.8oz) – that’s a lot more than a few teaspoons of blood. Like the vampire, the Amazon leech feeds on large mammals, which it attacks when they enter water, and it also uses an anticoagulant to keep the animal’s blood flowing. But the leech injects an anaesthetic, too, so that the temporary host is unaware of what’s happening to it.
All leeches are segmented worms – their nearest relatives are earthworms – and all, regardless of size, have precisely 32 segments. A few segments at each end of the Amazon leech are modified into suckers for attaching to prey, and every segment has its own independent nerve centre – hence a leech has 32 brains.
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Most inquisitive bird
NAME kea Nestor notabilis
LOCATION New Zealand
ABILITY curiosity
Parrots are highly inquisitive, but even among parrots, keas are exceptional. They’re native to New Zealand’s South Island, a cold, snowy, unparrotlike place where keas have to use all their wits to find a meal. While parrots elsewhere are flying from one conspicuous fruit to another, keas are searching under rocks and bark and in bushes, cones and shells for food such as roots, shoots, berries or insect larvae. This and a mountainous habitat virtually free of predators has, over 2.5 million years of evolution, made them insatiably curious. And they’re especially drawn to things they’ve never seen before. So when humans arrived in New Zealand, the keas were delivered a bonanza of new objects to investigate for food.
Nowadays great sources of fascination are camping grounds and ski-resorts. These parrots are large and have powerful beaks, and they can rip right through a canvas tent for the sheer joy of investigation. A particular favourite is the rubber on cars – windscreen wipers mainly. One gang of keas is said to have ripped out the rubber lining around the windscreen of a tourists’ hire car, causing the glass to fall inwards and opening up the interior. When the tourists returned, they found clothes, food and car parts scattered in the snow, while the keas appeared to be playing a game of football with an empty Coke can. The birds then retreated and watched – with great curiosity, it seemed – to see what the tourists would do about it.
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Most dangerous snake
NAME saw-scaled viper
Echis carinatus
LOCATION West Africa through the Middle East to India ABILITY injecting a venom that can kill more people than that of any other snake
This all depends on how you measure danger. Whatever is best at killing you is most dangerous. Luckily for humans, no snakes desire to eat us, but some can kill when defending themselves. The one that kills the most often is the saw-scaled viper. The one with the most toxic venom, however, is the sea snake Hydrophis belcheri. Like all sea snakes, its venom has evolved to incapacitate fish and suchlike, and it’s non-aggressive, lacks the striking fangs of vipers, and bites people only when accidentally handled in fishing nets. More dangerous in terms of fatalities is the beaked sea snake, which inhabits coastal waters and so comes into contact with people more often.
Many sea snakes are found in Australian waters, and Australia is also the country with the greatest number of venomous snakes. Eleven of the top 12 most venomous are found here, the world record-holder being the inland taipan, or fierce snake.
But Australia doesn’t hold the record for the most dangerous of all land snakes. Taking into account venom toxicity, venom yield, fang length, temperament and frequency of bite, the record goes to the saw-scaled viper.
It is widespread, small (therefore easily overlooked) and aggressive when threatened, and it probably bites and kills more people than any other snake.
Its name comes from the fact that, when frightened, it rubs its scales together, making a sawing noise – a reminder that most snakes would rather frighten people away than bite them. And, of course, far, far more snakes are killed by people than vice versa.
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Deepest diver
NAME sperm whale Physeter macrocephalus
LOCATION oceans worldwide
ABILITY diving deeper than any other mammal
Sperm whales behave more like submarines than air-breathing mammals. They disappear into the cold, dark ocean depths to catch deepwater squid or sharks and other large fish.
In 1991, scientists recorded an incredible, record-breaking dive of 2,000m (6,560ft) near the island of Dominica, in the Caribbean. But there is circumstantial evidence to suggest that sperm whales may be able to dive even deeper. On 25 August 1969, for example, a male sperm whale was killed by whalers 160km (100 miles) south of Durban, South Africa. Inside its stomach were two small sharks, which are known to live only on the seafloor. Since the water in that area exceeds a depth of 3,193m (10,475ft) for a radius of some 48–64km (30–40 miles), it is logical to assume that the sperm whale had been to a similar depth when hunting its prey.
The same whale also made one of the longest recorded dives for any mammal. By the time it surfaced to breathe, having caught the two small sharks, it had been underwater for an estimated 1 hour 52 minutes.
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Sleepiest animal
NAME brown-throated three-toed sloth Bradypus variegatus LOCATION Central America and tropical South America ABILITY doing as little as possible
A three-toed sloth has two modes of being: not quite asleep and asleep. It can sleep for up to 20 hours a day: the longest lifespan recorded for a sloth is 30 years, which means that that animal spent 25 years asleep. A sloth sleeps hanging upside-down from a tree branch, which is also what it does when it’s awake. The difference is that, when it’s awake, it pulls leaves off the tree incredibly slowly and eats them incredibly slowly. Then it moves along the branch at a speed that’s been worked out at 0.5kph (0.3mph) or less than 14m (45ft) a minute.
On a really eventful day, it descends to the ground and very slowly and awkwardly – since this is the only time it’s ever upright – makes its way to the next tree. Sometimes the next tree is on the other side of a river or marsh, in which case the sloth swims to it, using a kind of dog-paddle that’s strong and rather graceful compared to its walking but is, of course, very slow.
A sloth’s metabolism is much lower than that of other mammals, and in the morning it gets up to speed by sunning itself. It also digests slowly and only defecates once a week: for this event it comes slowly down from its tree, slowly digs a hole and deposits a third of its body weight (including urine) into it. Even the faeces, which are hard and dry, decompose at about a tenth the rate of other animals’ faeces.
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Fastest-growing plant
NAME tortoiseshell bamboo, or moso,
Phyllostachys edulis
LOCATION China and in cultivation worldwide
ABILITY growing literally centimetres (even inches) an hour
Bamboos are strange plants. For a start, they are giant, woody grasses. Most of the 1,250 or so species do all their growing in early life. Once mature, a bamboo doesn’t grow any taller, no matter how long it lives (and some survive for more than 100 years), preferring instead to send up more shoots. This means a stand of clumping bamboo, while getting no taller, can become impenetrably thick.
Flowering is eccentric, too. Many species flower only once in their lives when aged between seven and 120, and then die. And that means that every single plant of a particular species may set seed at exactly the same time and die at the same time. (This is a special problem for giant pandas, which eat virtually nothing but bamboo and face general famine every 30–80 years, when the local bamboo species flowers.) Bamboo is also hugely important to us (there are more than 1,500 documented uses for it), and up to 40 per cent of the world’s population depends on it. As for tortoiseshell bamboo, it invests a huge amount of energy in seed production but may survive flowering and is widely grown as a crop. It’s one of the tallest giant bamboos and probably the fastest growing. One shoot is recorded as putting on a metre of growth in a single day – that’s 4cm (1.6in) an hour – and another grew 20m (65ft 6in) in eight weeks. It really is grass that you could watch grow.
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Deadliest love life
NAME agile antechinus Antechinus agilis
LOCATION Australia
EVENT every male dies after mating, from stress
This little insect-eating, marsupial mouse has a short but promiscuous life.
Like all antechinus species, agile antechinus have a brief, two-week mating season when life becomes supercharged. Being secretive, nocturnal tree-climbers, their mating behaviour in the wild isn’t well known, but they are being studied in captivity by biologists keen to understand the effects of reproductive stress.
In July or August, males become flooded with testosterone and other hormones, and that’s when the mating frenzy starts. But it’s the smaller females who make the running. The males gather together in tree nests, where the females go to look for mates. The females seem to prefer dominant and therefore larger males, but they can’t be too fussy, since they mate with several different individuals. A male, too, mates several times.
Yet ejaculation goes on for at least three hours, and he stays locked to his mate for up to 12 hours, to make sure his sperm gets to her storage site first.
Alas, the surge of hormones and all the effort is just too much for his immune system. If gastric ulcers and kidney failure from stress don’t kill him, infections or parasites do, and he dies within days of his copulation – along with all other males in all the populations. Some females, though, live to mate a second year. They also have the upper hand when it comes to the gender of the next generation, as the sex ratio of their babies (which are kept in a true marsupial pouch) is often skewed towards females.
Extreme Nature
Mark Cawardine With Rosamund Kidman Cox