A rook is a crow in a crowd
|I am a jackdaw and barely get a mention
|I am a Jay and he reveals all my secrets
|I am a magpie and he keeps stum about my thieving
Rooks live and congregate together in large groups. Like other corvids - crows, magpies, jays, jackdaws and ravens they are very intelligent birds. They have as much neurological nous as those other animal geniuses, the cetaceans and the great apes. Indeed their ability to use tools might be greater than that of a monkey and I imagine a corvid looks down on them in distain.
In telling their stories I will more or less group them together. In intelligence there are variations between species and although clever individuals will out think their relations they all provide an insight into theory of mind. Serious estimations compare corvid intelligence with that of a four year old child. Some sources say seven!
A murder of crows
It is sometimes suggested that their intelligence has developed from living together in complex communities. They have excellent facial recognition and indeed can recognise and remember we humans too. They will remember a disservice and bare a grudge - perhaps a man with a gun. They will also remember and greet a friend, even bring him a present, after no contact in years.
It is said that crows can communicate their displeasure with an enemy. A murder of crows is a most apt expression.
It might seem inconsistent with the theory that intelligence might evolve from a need to cohabit in large groups when solitary corvids are equally clever. I wonder how much hybridisation has contributed to the shared intelligence between these animal Einsteins.
There are fascinating examples of crow hybridisation.
The carrion crow and the hooded crow are virtually genetically identical. In eight million DNA positions on their genomes variable code could equally apply to either species. Only in eighty three places is the code diagnostic for one bird or the other. Mind boggling when you consider that some of the differences between them are not insignificant.
An American bird breeder advertises his hybrid ravens as a means to circumvent the US laws against domesticating native species. They apparently make wonderful loving and caring companions.
(How on earth do you properly define a native species and why are American birds thought more worthy than our own?)
|Four years ago Cathi revived an expiring tiny sparrow that had been thrown out of his nest. Pimples is a happy little fellow that now flies freely in her home. No doubt he has outlived his thrusting brothers and sisters
Stone the crows!
I frequently nearly crash my car when dumb pheasants wander into the road. Not so with corvids. They steelily look you in the eye as they pick at some carrion and flit away at the very last moment. Even if you wanted to, you would fail to hit them. It is ironic and arrogant that magpies and crows are classified as vermin and can be shot on a whim.
Crows have been observed watching the traffic lights turn to red to take a serving of ‘road kill’. As the lights turn back to green they hop away to await the next course.
Japanese corvids exploit the traffic in a different way when cars shell their nuts that they drop in the road.
As the crow flies
They seem to have got cars ‘sorted’. An American professor has befriended the corvids that he studies. They recognise his car as he drives to the research site and fly in parallel with the driving seat as if they belonged to Air Force One!
Cathi tells me that a crow used to follow Harry’s bike to school every day. I can just imagine it slip streaming the back of his ears. The crow would fly home and pick his mother’s pegs off the line.
|I cannot imagine Harry on a bike
Although trivial, personal stories are best. Cathi remembers as a child in Africa when a corvid regularly mimicked her baby sister crying and her mother would come running. What was really clever was that the crow was not merely mimicking but was having fun as it cawed away at her mother’s ire.
|I am a young crow and follow the green crow code
I was recently enchanted by a letter in the New Scientist from Rod Cripps. I quote
“We have a local family of Australian Magpies. One morning a chick ran out into the road. Mother magpie immediately rushed out and grabbed the youngster by the neck feathers, dragged it back to the side of the road and vocally severely chastised her!”
What a fascinating story which encapsulates several corvid characteristics. Like humans they have a very long childhood because they have so much to learn. They clearly are able to communicate such information. In addition they do not just rote learn but can solve problems too.
In an Aesop fable a crow raises the water level in a pitcher to drink by dropping stones in the water. This has been experimentally verified when water levels have been similarly raised up in a beaker. When no stones were provided the crow flew off and brought back his own.
On another occasion a floating tasty caterpillar morsel was similarly elevated. Apparently when offered potentially floating ballast the crows have the wit to refuse it.
|I am a simple sparrow and cannot read the instructionss
|I just use my head
It is well known that some corvids fashion twigs to extract insects from nooks and crannies. They have learned from their parents the relevant pruning. Apparently designs vary with the birds geographical distribution - a sign of learned behaviour and a high level of thinking they share with the great apes. One clever crow fashioned a suitable hooked tool by twisting wire.
Cashing the cache at the crow bar
Jays have prodigious memories with regard to storing their food. They remember hundreds of sites and when to return before different foods ‘go off’ in the larder. They have well honed skills of deception when they know potential thieves are watching. Sometimes they will go back later to recache elsewhere. Jays that themselves have thieved are the most cunning cachers.
Sense of fun - crowing over the dogs
They have a rather cruel humour. A blog correspondent related the story of his daft dogs in his walled garden. The crows would goad the dogs and taunt them to chase. They would fly close to the ground and at the last minute would swoop vertically. The dazed dogs hit the wall. This was repeated ad nauseum and the dogs never learned!
|Floppy and friend
|He’s been shooting a line