Showing posts with label aggressive bird behaviour. Show all posts
Showing posts with label aggressive bird behaviour. Show all posts

Tuesday, 15 May 2012

Hawks Attack Parishioners At Indiana Church


Many people try to get by on a wing and a prayer, but the parishioners at an Indiana church could do without the wings, thank you.
Recently, a pair of hawks swooped down to the St. Joseph's Catholic Church in Mishawaka, Ind., and moved in upstairs.
At first, they were good neighbors who respected the sanctity of the church, but things have turned hellish recently, according to church pastor Father Terry Fisher.
"Up until a couple weeks ago they really weren't bothering anybody and we weren't bothering them," Father Fisher told WSPT-TV.
However, they have just started getting a little too protective about their nest and have begun swooping down and attacking people.
"They got one lady on the top of her head and she had to have stitches, and another woman on the side of her face," Father Fisher said.
They've been acting so satanic, in fact, that the church asked a higher power to intervene: the Indiana Department of Natural Resources.

Saturday, 31 March 2012

Tyson the vicious swan forces boat users to abandon river

Ready to rumble: Tyson is a fearsome sight as he lands among canoeists on the Grand Union Canal (Picture: SWNS)

The bird – which has a 2.4m (8ft) wingspan – targets rowers, canoeists and even walkers strolling on the river bank. 
Keen kayaker Joe Davies, 20,  capsized after Tyson was pictured  battering him with his huge wings on Tuesday afternoon. 
‘He went for me as I was falling in, which really made me panic,’ he said.

‘I’ve been kayaking on this stretch of canal for five years. I’d heard the  rumours about Tyson but I’ve never seen him before. I won’t be going back.’


Tyson has claimed a 3km (two-mile) section of the Grand Union Canal in Bugbrooke, Northamptonshire, while he rears his young. 
Linda Sgoluppi, 34, who lives near the waterway said: ‘He recently forced three canoeists out of the water. Anything that is rowed down the canal he sees as a threat.’

Swans can be particularly territorial during the March to May breeding  season. Tyson may now be moved 80km (50 miles) away to stop the attacks.

Read more: http://www.metro.co.uk/weird/894561-tyson-the-vicious-swan-forces-boat-users-to-abandon-river#ixzz1qbISBUEL

Thursday, 8 September 2011

Underground chick-killers filmed

Blind, featherless honeyguide chicks become killers within days of hatching, footage has revealed.
African honeyguide birds lay their eggs in the underground nests of other bird species.

Scientists from the University of Cambridge, UK, used night-vision cameras to film how the chicks interacted with the host brood.

Their recordings show for the first time that honeyguide chicks eliminate their competition in brutal attacks.

Found across Africa, honeyguide birds often parasitise the nests of bee-eater birds underground in abandoned tunnels made by aardvarks.

Previous studies had identified that their chicks have specially adapted needle-sharp beaks.

The maimed bodies of host chicks had also been discovered in nests where honeyguide chicks were raised.

But scientists had largely been in the dark with regard to the chicks' underground behaviour.

"We buried infrared video cameras within the hosts' underground nests to see what happened," said Dr Claire Spottiswoode, who led the research, published in the journal Biology Letters.

The footage revealed the honeyguide chicks grasping, biting and shaking their nestmates to death.

"While the apparent violence with which young honeyguides attacked their newly hatched foster siblings was quite shocking at first sight, it shows the power of evolution to shape amazing adaptations in parasites," said Dr Spottiswoode.

Exploitative behaviour
Despite being blind, featherless and in total darkness, the honeyguide chicks did not struggle to overpower the bee-eater chicks due to their size advantage.

When the attacks took place, the honeyguide chicks were up to three times the weight of bee-eater chicks.

"The honeyguide mother ensures her chick hatches first by internally incubating the egg for an extra day before laying it, so it has a head start in development compared to the host," Dr Spottiswoode explained.

The parasitic parent also ensured odds in favour of her young by puncturing the resident eggs when laying her own.

Host parents meanwhile were unaware of the violence in their nests, with researchers even recording one attempting to feed the parasitic chicks while they tried to attack the other young.

After a month of care, the honeyguide chicks emerged from the burrow, no longer sporting their killer beak-hooks which had grown out.

The exploitative behaviour of honeyguide parents can be compared to that of cuckoos, but evolved separately in the unrelated species.

"This behaviour is exactly analogous to that of young cuckoos, which hoist host eggs or chicks onto their backs and tip them over the rim of the nest," said Dr Spottiswoode.

"But because honeyguide hosts breed in tree holes or underground burrows, honeyguides can't eject host chicks and have instead evolved this highly effective killing behaviour to make sure that they alone monopolise the nest.

"Each time brood parasitism has evolved we see specialised adaptations, which are no less astonishing for being sometimes rather gruesome."

Honeyguide Facts
  • Researchers were studying greater honeyguide birds (Indicator indicator) in Zambia, Africa


  • Species of the Indicatoridae family, also known as indicator birds, are best known for their interaction with humans


  • The birds lead human honey-gatherers to bee colonies and feed on the grubs and energy-rich beeswax uncovered by human hands and tools

  • http://www.bbc.co.uk/nature/14802180

    Thursday, 25 August 2011

    Attack of the killer ravens: Flocks are suddenly slaughtering lambs - what is going on? (via Nick Redfern)

    High in the darkening sky, a flock of enormous ravens swoop and swirl - narrow black wings stretched wide, heads protruding forward and huge hairy beaks scything through the air.
    Every few minutes they let out deep, throaty, honking calls as they soar effortlessly, circling around until, finally, they spot their prey and swoop.

    But forget dormice, voles or even small furry rabbits; these sinister looking birds are feasting on something far larger - newborn lambs.

    And instead of hanging around for a few discarded bones or a forgotten carcass to pick and claw at, they've started killing live farm animals - by pecking them to death, in horrific scenes reminiscent of Daphne du Maurier's The Birds, turned by Alfred Hitchcock into one of the most chilling movies of all time.

    Throughout Britain, traumatised farmers have reported a sudden and disturbing rise in the number of livestock being attacked by ravens.

    Farmer John Kirk, 50, from Nethybridge, near Aviemore, has lost more than 40 animals in the past few weeks.

    "It's like something out of a horror film. They are horrible, horrible birds. They see the young lambs and just fly down and help themselves," he said.

    "Sometimes you find a carcass with the eyes and tongue pecked out, but sometimes all you find is the skin. They peck away until nothing is left." And while some animals have been pecked to death, others have been left to die in agony after birds have feasted on their eyes, tongues and the soft flesh of their underbellies.

    The worst-hit areas are in Scotland and Wales, but there are also reports of random attacks across the South-West and the Lake District.

    The Scottish Isle of Mull has been badly hit, with one farmer losing 20 lambs in a fortnight.

    Another, Robert Millar from High Catterdale, Kintyre, said: "We've had 12 to 15 lambs attacked. It's got to the stage where you have to lamb indoors, or you don't stand a chance."

    And Jimmy Mills, a farmer from Stratherrick, south of Inverness, has lost seven lambs in just three days: "The lambs are born at 1pm and by four o'clock they've been taken to bits by the ravens," he says.

    According to Johnny Hall, of the National Farmers Union of Scotland, it's no longer just lambs: "Raven attacks have become a huge problem across a wide area of the country.

    "We have substantial evidence of them attacking adult sheep and calves, too. The attacks are so horrific that it's causing mental suffering to people who find the animals."

    The worst thing is, there's not much the farmers can do about it. Ravens are protected by law, so farmers can't shoot them as they would other vermin.

    They can be killed on special licence - due to a condition in the Wildlife and Countryside Act 1981 - but only if the Government deems it appropriate.

    But farmers say the system is designed for the "odd rogue bird", not the huge swirling flocks of recent months, and are demanding the law is changed.

    The question is, why have ravens suddenly started to attack livestock?

    Experts cannot give a definitive explanation, but some believe it is simply the pressure on food resources caused by the dramatically increasing raven population.

    In parts of Britain (Scotland, in particular) experts believe numbers have increased five-fold since the late Nineties, and according to the RSPB there are up to 6,000 breeding pairs in Scotland - almost half the numbers in Europe.

    Davy Thomson, vice-chairman of the Scottish Gamekeepers Association, says it is not breeding birds that cause the problem, but immature birds, scavenging in large packs.

    "I've seen several hundred birds roosting together, and all they do is hunt one side of the hill and then move onto their next food source.

    "Raven populations have increased massively in the past ten years, and it's an absolute nonsense that we can't control them."

    However, according to Dr Andre Farrar, spokesman for the Royal Society For The Protection Of Birds: "Some reports of raven attacks may be exaggerated, but they do kill things.

    "They make a speciality out of scavenging and eating carrion. In many cases their prey is already dead, but they're highly capable of killing, so sometimes they'll finish it off themselves.

    "But they get an unjustly bad press. Any big, black bird tends to come down from history with a load of negatives attached. So the raven has got a burden of cultural mistrust around it."

    Such as its association with death, and its supposed supernatural powers of prediction.

    Irish folklore has it that each raven contains three drops of the Devil's blood, and anyone who hunted them would be on the receiving end of the Devil's fury and a lifetime of bad luck.

    Its status as a bird of ill omen is confirmed by a cameo appearance in Shakespeare's Macbeth - as the King nears the castle at Inverness, Lady Macbeth utters the ominous words: "The raven himself is hoarse that croaks the fatal entrance of Duncan under my battlements."

    Legend has it that if anything happens to the six resident ravens at the Tower of London - attended by a Yeoman Ravenmaster, and treated to a daily feast of raw meat and blood-soaked "bird biscuit" - England will be invaded.

    Aside from all the folklore, they're an impressive foe - up to 2ft long and worryingly adaptable: they can survive in Arctic, temperate and desert climates.

    Research published last year in the Scientific American also showed the raven to be one of the most intelligent species on the planet - up there with dolphins and apes and, unlike most other birds and animals, capable of learning from their own actions and from observing others' behaviour.

    They're thought to be one of the few birds that can count, and some have even learned to fashion leaves into special tools for extracting grubs from crevices in trees.

    In Japan, they were reportedly found dropping nuts onto a dual-carriageway, then darting down to eat them once the cars had cracked them open.

    Although older ravens (they live up to 25 years) mate for life and travel in pairs, young birds may form flocks of up to several hundred - collective nouns for ravens include an "unkindness", a "conspiracy", and a "murder" - which swoop on farm animals.

    They were almost exterminated during the 19th century, but in the past 20 years have made their dramatic comeback, partially because they have been protected.

    As Dr Farrar puts it: "A few years ago, you'd hope to see them only in Scotland, or Wales, but now they're popping up in parts of eastern England - they've even been spotted in Bedfordshire."

    But he insists it's not all bad. "Ravens are truly spectacular birds, with an amazing display flight - they flip over into a half-roll and back again when they're flying - and have a deep sonorous croaking call. They're stunning to watch."

    Which all sounds rather poetic, but must be scant comfort for the farmer rendered helpless as another dark, swirling, unkindness of ravens starts circling in the skies over his lambs.


    By JANE FRYER
    http://www.dailymail.co.uk/news/article-563931/Attack-killer-ravens-Flocks-suddenly-slaughtering-lambs--going-on.html

    Thursday, 11 August 2011

    Bird song-sharing like verbal sparring

    While singing the same songs as your neighbours may sound harmonious, research conducted at Queen’s University Biological Station (QUBS) suggests that song-sharing amongst song sparrow populations is actually an aggressive behavior, akin to flinging insults back and forth.


    “It’s been hypothesized that repertoire size and song complexity is about the singer’s ability to advertise their quality as a mate,” says lead author Janet Lapierre, a visiting biologist from the University of Western Ontario (UWO). “Song-sharing, where birds sing a smaller number of their species’ greatest hits, is a more aggressive and attention-seeking behaviour. It’s also a behaviour most often displayed by belligerent older males.”

    Ms Lapierre and fellow QUBS researchers Daniel Mennill (University of Windsor) and Beth MacDougall-Shackleton (UWO) used a 16-channel acoustic location system to investigate whether male song sparrows preferentially choose to sing highly shared song types or whether they use all song types interchangeably. They found no general tendency amongst the sparrows to either preference.

    Instead, they found that the performance of highly shared songs is determined more by individual differences like age and the kind of neighbourhood the sparrows live in. ‘Tougher’ neighbourhoods had a higher percentage of sparrows who engaged in more aggressive song-sharing bouts, whereas ‘mild-mannered’ neighbourhoods tended to support more conflict-averse sparrows that avoid using shared song types.

    Older male sparrows were the most likely to engage in more aggressive or attention-seeking song-sharing bouts, suggesting that older males may be more willing or able to risk conflict and may also have more experience in which songs are effective signals in their local area.

    “The novelty of this study was that we looked at how birds use songs rather than just examining the content of their repertoires,” says Dr. MacDougall-Shackleton, a biology professor from the University of Western Ontario and a regular QUBS researcher. “We really could not have done this research without the longstanding study population of song sparrows at the Queen’s University Biological Station.”

    These findings were recently published in Behavioural Ecology and Sociobiology.

    http://www.queensu.ca/news/articles/bird-song-sharing-verbal-sparring
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