Animal of the Week -- July 28, 2008

I suppose that the name "Animal of the Week" doesn't necessarily imply there has to be an animal every week, just that when there is one, that's the animal of that week. And a week is pretty much undefined, there's the strict Monday to Sunday concept, but then any group of seven adjacent days is also a week. So the animal of this week is Ptilocercus lowii (pen-tail tree shrew).

Now, as someone who is not averse to the odd jar myself -- I was impressed to read in the newspapers earlier this week that these diminutive distant relatives also actively seek out alcohol and drink enough to be drunk 36% of the time. In the forests of Thailand and Malaysia they are to be found supping on fermented nectar from the flowers of bertam palms. However, the reasearch, published in the Proceedings of the National Academy of Sciences USA shows that rather than get drunk, the alcohol is disposed of in the tree shrews' hair as a chemical that is also found in the hair of humans with chronic alcoholism [those that have hair, eh? -- Ed][Shut it you! And who the hell is this ed anyway? -- PH].

Thought to be similar to the last common ancestor of all primates that lived about 55 million years ago, pen tail tree shrews, named for their mostly naked tail fringed with lateral hairs like a quill on the last third, are the only nocturnal tree shrews. If disturbed during the day they are sluggish, responding by rolling on their back, hissing, urinating, and defecating in defence. I think the researchers who say these critters aren't affected by the booze had better think again.

Much has been made of their prodigious alcohol consumption -- but it turns out the nectar of the bertam palm is only 0.5–3.8% alcohol. It's hardly a bottle of tanqueray now is it? I'll let them off though, at only 50g, they're definitely not lightweights

Animal of the Week -- July 7, 2008

After the most recent animal of the week a goodly number of folk contacted me to let me know that they had recently seen silverfish, a surprisingly small number, or zero, of these correspondents felt as well disposed towards the graceful little darlings as I do -- most feeling repulsion, disgust, or even fear.

I suspect that this week's animal might also divide opinion, but I'll probably have one or two more people on my side, as this week's animal is the scourge of one of the biggest causes of animosity among neighbours in modern day towns, villages, and suburbs. Although they are a gift to the producers of TV shows about societal conflict in the form of boundary disputes, a great many people abhor leyland cyprus arbors; but across the land, there is a new friend to those living in the shadow of the much loathed conifers -- Cinara cupressi (cypress aphid).

Probably originating in southeastern Europe, these grey 2–3 mm aphids are now found on every continent but Antarctica where it is warm enough for them to breed. In the UK their numbers are largely kept in check as cold winters kill off large numbers of them. However, due to global warming caused by people reading ridiculous almost-weekly emails about animals and the like, last winter the temperature in the southeast was practically tropical throughout. As a consequence these little beasties survived in large numbers. A couple of months ago they began their onslaught, sucking the sap from leylandii hedges up and down the country. Now, the damaged plants are turning brown, whole section and some complete plants dying.

Obviously, this is pestilent behaviour by the aphids, but the hedges are stupid, so good on them I say. Except for those attacking mazes, the only acceptable use for a leylandii. I love a maze, even though I know how to do them and have to resist the temptation to cheat.

Throughout the summer the aphids reproduce parthenogenetically -- ie, the females spew out identical miniatures of themselves without the involvement of any male aphids. A female may contain another female that is already pregnant with the first female's granddaughter, like an entomological russian doll. As winter approaches males are produced by withholding one of the sex chromosomes from some offspring, these mate with females who then lay eggs which overwinter. I like this about aphids, it's neat.

Next week, I hope there will be an animal and maybe even not an insect.

Until then, stay safe, and look out for dying shrubberies.

Animal of the Week -- June 23, 2008

It can't possibly have escaped your attention that this week in the UK is National Insect Week -- so naturally I am going to join in the celebrations by nominating an insect as this week's animal. But what to go for? Something gaudy and noticeable, such as the swallowtail butterfly or hummingbird hawk moth, both occasional visitors to these shores? Or maybe our largest insect, the stag beetle, which reaches lengths of up to 7 cm including its antlers? Perhaps a lovely lazy bumble bee, many species of which are in decline all over the UK, or our rarest insect the streaked bombardier beetle, which repels predators by squirting a noxious combination of hydrogen peroxide and hydroquinone that explodes with a noisome smell and a loud pop. Damn it! Perhaps I should do all insects. The most diverse group of organisms on the planet perhaps accounting for 90% of species diversity -- although that might take me some time.

Nah, tell you what, among all the glamorous options, let's celebrate a much maligned species which is one of my favourites, Lepisma saccharina (silverfish). These primitive wingless insects (contrary to some misinformation, not all have wings) have remained largely unchanged for the past 300 million years. I guess they get a bad rep for living among rotting wood and damp places in bathrooms, but really they are just probably eating shampoo residue and other stray starch and cellulose based products such as wallpaper paste, glues, or toast. While they might occasionally start nibbling at the gum holding books together, or in rare times of famine nibble at leather or natural fibres, they're probably not doing much damage to your stuff, they just like damp places... and if your books are damp enough to attract silverfish, you've got damp books anyway.

Most commonly seen fleetingly as they retreat from bright light, nocturnal silverfish glide gracefully with glaucous iridescence, undulating like a minnow across your bathroom floor. I think they are quite beautiful. According to wikipedia, "The reproduction of silverfish is preceded by a "love dance", involving three phases, which may last over half an hour. In the first phase, the male and female stand face to face, their trembling antennae touching, then repeatedly back off and return to this position. In the second phase the male runs away and the female chases him. In the third phase the male and female stand side by side and head-to-tail, with the male vibrating his tail against the female", after which the male deposits a gift of sperm, wrapped in gossamer, which the female picks up. How much of the first bit is true I am not sure, the second bit about the giftwrapped seminal present, however, is true. Although they stop short of a post-coital smoke.

So cut these most ancient but graceful creatures some slack for the remainder of National Insect Week, June 23–29.

Animal of the Week -- June 16, 2008

Many thanks for all the messages I received during the hiatus; sadly many people contacted me to tell of long distant relatives who had died leaving me a fortune in a foreign country or even of offers whereby I help someone with a simple money transfer of a few million dollars, from which I can take a sizable percentage for my troubles. Well, with money like that coming in I doubt there'd ever be the need for a break in AOTW again, so Bayo Bashan, Moham Bello, Mrs Awa Zoundi et al, I shall be sending you my bank details as soon as I have got this week's (or more correctly, this quarter's) AOTW out of the way.I have said before that I will never do a fictional or mythical animal, despite the temptation to do a phoenix this week (although that might be building up my return a little too much), but this week's animal of the week is.... wait for it.... A UNICORN.

OK, it's not a unicorn, but the story reported in the unpopular press of the London Underground of a one-horned roe deer, nicknamed unicorn, roaming an Italian forest piqued my interest. This genetic aberration is one of the more mundane possible sources of unicorn myths -- although a very likely source of the myth of the Kirin, the one horned beer, er deer, of Japanese myth.My personal favourite contender for the origin of the unicorn in mythology -- which has it origins in Persia and China -- is this week's Animal of the Week, the extinct giant rhinoceros Elasmotherium sibiricus. Two metres tall, six long, covered in fur, and sporting a metre long horn on the centre of it's nose, E sibiricus was the largest of the extinct genus and lived on the steppes of Russia. The latest fossil evidence of the animal comes from about 1 million years ago, but there are some who believe that this animal could have survived into the folk memory of people who lived on or passed through the steppes. There are even some accounts by mediaeval travellers of a giant one horned beast that would run down horsemen, picking the rider from the back of his or her steed, gore them to death, but leave the horse unharmed that some suspect might have been remnany populations of one elasmotherium or another. Although more closely related to rhinos than to horses, elasmotheriums were more equine in many ways as they were adapted to a cursorial existence on the open plains of Asia.

Other putative candidates for the source of unicron myths include oryx (Middle Eastern antelope) and aurochs (wild oxen), both of which, when viewed in profile as they would commonly have been painted or carved in ancient artwork, both appear to have a single horn. Of course, other genetic mishaps among antelope, deer, and goats such as created the unicorn deer are possible, and some travelling circuses and inventive scientists supposedly have created unicorn goats by fusing the horn buds of newborn goats. Poor goats.

But I like the the elasmotherium theory, the elasmotheorem if you will, of unicorn origins.

Animal of the Week -- March 10, 2008

Where the hell has the time gone? March is half way over already. But the rapid passing of a few months is nothing for this week's animal of the week Pseudobulweria becki (Beck's petrel), which has been missing, presumed extinct, for the past 80 years.

Petrels are sea birds related to fulmars and albatrosses, collectively known as the tubenoses due to the structure of their nostrils atop their bills. Some petrels are among the most numerous species of sea birds. But not Beck's petrel -- known from two specimens collected in the 1920s, it had not been reliably spotted since 1929. Repeated unconfirmed sitings kept alive the hopes that a population of this species was clinging on in the western Pacific, but the similarity of Beck's and the closely related Tahiti petrel made many ornithologists sceptical of their survival.

Last week, however, Hadoram Shirihai -- an Israeli ornithologist with a rep for discovering new species and the only person to have visited all sub-Antarctic islands to see all the species of albatross -- reported photographing 30 or so birds feeding alongside Tahiti petrels in the Bismark Archipelago northeast of New Guinea. Smaller in size than their companions, he recognised them as the errant Beck's petrel. The group contained adults and juvenile birds, showing that a breeding population is hanging on somewhere in the region. The discoverer of the species, Rollo Beck, suggested that this species bred in low lying atolls in Melanesia. Secretive birds, most petrels return to breeding grounds at night making them especially difficult to track.

Petrels have a habit of hovering above the surface of the sea, their feet just touching the water as they pick off surface dwelling plankton and small fish. This habit is the origin of their name, which is derived from St Peter who was said to have walked on water, his feelings towards plankton, however, are lost to hagiography.

The exciting news about the rediscovery of the Beck's petrel resurrects hope for other missing species such as the Newcastle Brown Whale, the Guiness Black Stoat, the Famous Grouse and the Kronenbourg sixteen-sixty-doormouse.

Sorry!

Animal of the Week -- March 03, 2008

Hello All!

I apologise if any of you chaps had nightmares about the snakeheads slithering their way to your doors with the limb-like fins and toothy jaws. I dare say that the majority of you living in the UK had any piscine pursuers shaken from your dreams as you were shaken from your beds. It is a curious coincidence that shortly before Britain's biggest earthquake in nearly 20 years, I was reading a passage in Darwin's peerless journal The Voyage of the Beagle that described an enormous earthquake in Chile. On February 20, 1835, the edge of Chile was shifted nearly a foot upwards by tectonic activity. Fortunately for Darwin, at that time visiting the Chiloe archipelago, he experienced only tremors of the earthquake. Concepcion, the city above the epicentre was utterly ruined when Darwin arrived a few days later, the devestation too harrowing for Darwin to put into words.

Also present on the Chiloe archipelago on February 20, 1835 were representatives of this week's animal of the week Pseudalopex fulvipes (Darwin's fox or Darwin's zorro). This small fox-like dog, dark grey with rufous trim, is related to other South American grey foxes on the mainland, but is proportionately longer in body and shorter in limb. Until the 1970s, the species was thought confined to Chiloe, but a small population was discovered some 600 km away on the mainland, at the other end of the now submerged land bridge that linked Chiloe to the mainland until sea-levels rose at the end of the last ice age.

Darwin's fox is critically endangered with fewer than 100 in the mainland population and around 250–500 on Chiloe. Charles Darwin was the first European scientist to observe the fox, specifically one fox watching curiously the officers of The Beagle work on the ship, at which point he made his own contribution to the endangerment of the canine that would come to bear his name as this, typically dry yet amusing, passage from The Voyage shows:

A fox (Canis fulvipes), of a kind said to be peculiar to the island and very rare in it, and which is a new species, was sitting on the rocks. He was so intently absorbed in watching the work of the officers that I was able, by quietly walking up behind, to knock him on the head with my geological hammer. This fox, more curious or more scientific, but less wise, than the generality of his brethren, is now mounted in the museum of the Zoological Society.

Genius!

Animal of the Week -- February 25, 2008

Morning/Afternoon/Evening all,

As the days lengthen and the sun makes itself felt, thoughts might turn to long summer days whiled away on the banks of a river...especially if a friend of your posts photos of your teenage selves enjoying such a halcyon day on Facebook. But how keen would we have been launch ourselves from the overhanging tree into the turbid stream had we suspected the presence of Channa argus (northern snakehead) or C micropeltus (giant snakehead) in the slow-moving muddy-bottomed river?

Last week, a Lincolnshire angler fishing for pike got a surprise when his sprat attracted the attention of a more exotic fresh water predator 60 cm long and with a mouth crammed with nasty sharp pointy teeth. The fish was later identified as a giant snakehead, a voracious predator from southeast Asia. Capable of growing 2 m long, giant snakeheads are valued as sports fish and food fish, but treated with caution as mothers have been known to attack people to protect their young. Snakeheads breath air rather than extract oxygen from water with their gills as most other fish do, and they can survive several days out of water, and rather terrifyingly these toothy monsters can crawl overland from pool to pool, from one water catchment to another. If you are terrified by the idea of a 2 m giant snakehead crawling into your front room in Lincoln, fear not. These fish need warm water to survive, and the one caught in Lincolnshire had likely been released only very recently by a tropical fish enthusiast whose tanks had been outgrown.

Phew! Right? The more attentive of you will note that this week's animal is also the northern snakehead as well as the giant. The former is similar to the latter in size, habits, ferocity, and ability to crawl over land, but what makes it more terrifying for those of us in temperate latitudes, is that, living in northern China and Russia, these fish can very happily survive in colder climes. Already across the USA, northern snakeheads have invaded lakes and rivers, wreaking destruction to fisheries and wildlife in their wake. One population in Maryland was thought to have become established after a man purchased a pair from a Chinese food shop to make his sick sister a traditional remedy.

Fortunately for us Europeans, trade in these leviathans is banned for both aquarists and enthusiasts of Chinese gastronomic remedies. So we are protected from the northerns for now... but what if that giant snakehead wasn't a recent escapee, it's been a mild winter after all, and what with global warming, perhaps they are breeding in the UK!! Perhaps there's a giant snakehead slithering to your door right now!!!

Thank god I live on the third floor; although I may have to rethink my summer swims in Hampstead ponds. Dammit!