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Heterochromia – The Eyes Have It

Monday, 30 May 2022

There are a number of reasons why animals can have one eye of one color and the second of another, but the term for the most likely cause is heterochromia.  It is more often than not to do with melanin. This is a pigment that is found almost everywhere in nature (spiders being a notable exception) and it dictates such things are skin and eye color.

The Spiders That Decorate Their Own Webs

Wednesday, 13 January 2021

Spider webs – possibly the most beautiful and intricate animal structures of the natural world. However, some spiders are not content with a simple web. They go one step further.

Some spiders decorate their own webs with even more elaborate and complex patterns than are necessary.  Could they be the best exterior designers on the planet?  Certainly from the look of these examples, they would be in the competition but the verdict is still out as to why they produce these extra web configurations.  Some scientists argue that it is nothing more than ’spidey’ aesthetics.  Take a look at some of these arachnid designs and come to your own conclusions.

The Kangaroo that Went Back to the Trees

Saturday, 15 September 2018

When you hear the word kangaroo what you may well imagine is the large marsupial bounding with immense speed across the Australian landscape – and you would not be wrong.  However, at one point the ancestors of one particular family of kangaroos did something strange.  They returned to the trees whence they had come.  This is the tree-kangaroo and they are the marsupial equivalent of monkeys.

The Silkie – Tribble Rabbit Muppet Chicken Thingy

Monday, 16 May 2011

Marco Polo wrote about them. Sideshows exhibited them as a cross between a chicken and a rabbit. Some say it is the closest thing the bird world gets to a tribble. Others that it must be some kind of refugee from The Muppet Show. This is the Silky. It is quite probably the coolest breed of chicken on the planet, particularly when it comes to its fabulous plumage. The general fluffiness of the Silkie makes it unusual, not to mention attractive, but it has many other endearing qualities as well as an interesting history.

They are one of the calmest chicken breeds and they generally never run around like, well, like a headless chicken.  In fact they love nothing more than to grab a perch and just watch the world go by.

They are kept for pets but the hens are renowned for being wonderful mothers. As well as incubating eggs they have laid themselves they are quite happy to do the same thing for any other eggs you might wish to pop underneath their fluffy frame.

In fact, it is not unusual to see them trotting around a farm yard with a host of (not so) ugly ducklings in tow behind them.

The Silkie makes a great mother and is unusually docile and trusting, even for a chicken.

Perhaps too trusting. BEHIND YOU!!!

I said, BEHIND YOU!!!  I can't look! You may not want to see the third picture in this sequence, reader. Seriously, rest assured that no silkies were injured in the creation of these pictures. In fact, cats and silkies have been known to share a crib.

"Excuse me? Could you make a little room? Just a little? Oh, sigh. Never mind."

Though sometimes a silkie can get home and discover unwanted house guests crashing the place. If that ginger tom could talk he would be just about to say one short sentence.  "What d'ya want, birdie?"

However, back to the breed itself rather than interspecies mingling. The plumage of the Silkie is what instantly attracts and the feel of it gives the bird its name. It also makes the Silkie unique among chickens. The light and soft feathers, so reminiscent to the touch of fur, can appear in individual chickens as a result of a recessive gene. However, the Silkie is the only chicken to possess it as a breed.

They come in a variety of different colors, from white to black, taking in red, blue and buff in-between. What you can’t see, however, is their black flesh and bones below, very unusual among chickens. Other features that set them apart from most chickens are their five (instead of four) toes and those striking blue earlobes.

The species is thought to have originated in China and, true to say, there in something eastern in their look and certain inscrutability. They arrived in Europe (and from there the New World) via the Silk Route. The most famous European to follow that path was Marco Polo and his accounts tell of a furry chicken which was possibly the Silkie.

They certainly didn’t fly out of China. Their feathers, so soft and downy render them incapable of flight. You may have noticed that in some of these wonderful pictures the bird(s) seem to have a muff of feathers under their beak which covers their blue ears, while some do not. These are not separate breeds but varieties and are known as bearded and, you guessed it, non-bearded.

It took quite a while for the breed to be formally recognised in the US. In fact it was accepted in to the Standard of Perfection in 1874 (which was, admittedly the first time it had been published0. Yet despite this acceptance rumors about the Silkie have abounded and persisted.

One of the most unrelenting tales is that the Silkie is, in fact, a hybrid of a chicken and a rabbit. While you can see – obviously – while the more credulous people may have believed this in centuries gone by it is a legend which has proven fairly difficult to dispel. In Victorian times they were often shown in travelling shows and billed as such an interspecies cross, with people being told that they had mammalian fur. You can just imagine Barnum buying a dozen and crossing his fingers. You can see why, perhaps.  Do these chickens have heads?

Today, however, the Silkie has become a popular breed of ornamental chicken. They are popular with smallholders not only for their looks but because the hen is about the broodiest bird on the planet. Any extra eggs from any breed of poultry will be gladly welcomed in to the brood to be of a mother Silkie who herself produces around three eggs each week.

Some of you are probably asking the question, yes, but what do they taste like? Perhaps because of their black skin (see a dead pair here if you must!) the breed has escaped intensive farming in the West – or it could be the simple fact that it does not produce as much meet as other breeds of chicken. Underneath that ball of fluff is quite a skinny chicken, believe it or not. In China, where they are known as wu gu ji – literally the chicken with black bones – they are regarded as suitable for gourmet tastes.

Although this is not a site that marks out animals as pets (or tells you where to buy them or how to look after them), it has to be admitted that if you want a chicken as a pet then the Silkie is an ideal. They are composed, amicable and sociable and they like children. In other words they are quite docile. Although this means that they can be bullied by other birds they tend to do well in human company.

We have now, hopefully, firmly established that the Silkie is not a rabbit – or indeed a tribble – but very much a bird. It has to be said it is an unusual looking winged, bipedal, endothermic, egg-laying, vertebrate but you know something? However, this, with apologies to EB White and Charlotte is some bird. Some bird indeed.

Army Ants Go Marching – Until…

Friday, 21 January 2011


By Guest Blogger Dan Lewis
Editor of Now I Know

Dan Lewis  is the force behind the free daily email service Now I Know.  Like the  old adage you learn something new every day, Now I Know feeds your mind  with a variety of different things each day with which you can impress  your work colleagues, friends and family.  Or not.  Whether you keep  this new knowledge to yourself is up to you. However, you should really think about subscribing - click the image to take you there or subscribe to his newsletter here.

At a young age, children in the United States learn -- via a common toddler tune -- that ants congregate and march, as a horde, toward a common destination.

Here is the first verse of the nursery rhyme.

The ants go marching one by one, hurrah, hurrah
The ants go marching one by one, hurrah, hurrah
The ants go marching one by one,
The little one stops to suck his thumb
And they all go marching down to the ground
To get out of the rain, BOOM! BOOM! BOOM!

While this isn't true for all ants, it is indeed the life of a few hundred species of ant, collectively known as "army ants." Army ants are typically nomadic, traversing great distances in search of food before setting up temporary nests, only to move again shortly thereafter.

The main foragers lead the way and emit pheromones -- chemical secretions other army ants can detect -- in order to give the rest of the clan a trail to follow. Those ants which can't detect the pheromones (a situation which commonly happens as armies grow large) simply follow a nearby ant. This allows for army ant brigades to extend for extraordinary lengths, at times observed to extend a half-mile long.

The children's rhyme goes on... and on, until it reaches its climax in its tenth verse.

The ants go marching ten by ten, hurrah, hurrah
The ants go marching ten by ten, hurrah, hurrah
The ants go marching ten by ten,
The little one stops to say "THE END"
And they all go marching down to the ground
To get out of the rain, BOOM! BOOM! BOOM!

So, that's a happy ending for those ants. But what happens when a group of ants loses the pheromone scent? Who leads? The answer: No one. Or everyone, depending on your perspective. The ants form an "ant mill" -- a continuously rotating circle of ants, each following one another, but going, net, nowhere, as demonstrated in the videos below.


The ant mill is, ultimately, fatal, as the ants die of exhaustion.


Bonus Fact
One type of army ant, those of the genus Dorylus, (seen above) are particularly dangerous. Native primarily to central and east Africa, armies of Dorylus ants can number up to 50,000,000 -- that'sa number 33% larger than the (human) population of California. By human standards, these columns move slowly, a mere twenty meters each hour, so in most cases, Dorylus are a significant nuisance -- but not much else. However, by sheer force of numbers, Dorylus have been known to overwhelm human victims too young or frail to move, causing suffocation and eventually, death.


Black Squirrel, Brown Tail

Friday, 16 April 2010

Ark In Space reader Kathleen Connell of East Moline Illinois recently snapped this little guy a black squirrel – with a brown tail.

Out of the squirrel population of the United States and Canada  perhaps only one in ten thousand is black.  However, this is not a separate species in itself.  It is in fact a sub-group of the grey squirrel and, little by little their numbers are growing.  In fact in some areas they outnumber the greys.  However, this black coloring is not a recent trend among the squirrel community – research indicates that in the days before the European settlement of the America the black squirrel was probably much more numerous than the grey.

The question is – how did it get like this?  Does anyone know?  It seems to be a combination of both colour. Answers in the comment section please!

A Clockwork Corn

Sunday, 11 April 2010


Squirrels + Corn = Video Opportunity. Watch this marvellous time lapse video of a bunch of squirrels (can't just be the same one, surely?) attacking their favorite food of the winter - good and healthy corn straight off the cob! And boy, do they tuck in!

The time lapse technique is used wonderfully here and it is fun watching the cob spin around as the squirrels devour it (hence the brilliant name for the piece I guess!). One to watch again and again!

This video was made by Vimeo member Mark Svoboda and was shot in an approximately two hour period.  As it is produced by Backyard Boredom Pictures, we are assuming that it was shot in Mr Svoboda's back yard - but of course we could be wrong on that point.  Wherever it was shot - thank you for a few minutes of great fun!

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