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JAY Shrieker of the Woods ABOUT BIRDS : JAY Shrieker of the Woods The wary Jay is more often heard than seen. Bright, beautifully marked and a wonderful mimic, the Jay is a bird full of character and ruffian charm. Here, Mike Toms looks at what makes this bird one of his favourite garden visitors. here is a strong bond between the Jay habits, the species was heavily persecuted and the oak woodland which it favours; throughout the 19th Century, driving the Ta bond that underlines the balance of population into decline. Nature writers of By Mike Toms interactions existing between two organisms the time were unanimous in their description GBW Organiser that have co-evolved over great periods of of a species facing a relentless onslaught of time. The Jay, the most arboreal of all our persecution. Despite this unceasing slaughter corvids, not only relies on oak woodland for the Jay clung on, perhaps because its secretive nesting opportunities but also takes the bulk of habits made it difficult to eradicate, and its winter diet from oaks, in the form of acorns, numbers began to recover during the early 20th which it collects and buries during autumn Century. This was due in no small part to the for use as winter bites. In fact the scientific fact that so many gamekeepers were removed name of Garrulus glandarius, given to the Jay, to another slaughter, that of the Great War. acknowledges its close relationship with the Two other changes also favoured the oak and its fruit; glandarius derives from the Jay’s recovery at this time. The first of these Latin glandis (‘acorn’). Despite the strength of was a change in fashion, with bird plumage this association the Jay remains an adaptable no longer the must-have accessory for any bird, readily venturing into gardens to seek outfit. The Jay’s blue wing feathers had been out peanuts, bread and other scraps put out by in great demand for this purpose and also, to garden birdwatchers. a lesser extent, for the tying of flies for game fishing. In 1880, near the peak of fashion CHANGING FORTUNES interest in decorating outfits with feathers, the The changing fortunes of our Jay population Duchess of Edinburgh (Maria Alexandrovna) reflect changes in our own attitudes towards this sported a muff made entirely from Jay feathers. bird. Widely condemned for its nest-robbing Rightly so, despite her being a Russian grand Jay in profile by Steve Round | Autumn 2008 Bird Table 55 JAY duchess (by birth) and a British royal duchess make a hole in the ground at a 45-degree angle. (by marriage), she was heavily castigated by One or two acorns are then deposited in the FACT BOX many naturalists for such wanton plunder. hole before the bird uses sideways movements The early part of the 20th Century also saw the of the bill to cover its store. Common name: establishment of the first conifer plantations Jays appear able to relocate a large Jay across the tracts of ‘poor quality’ land spread proportion of the acorns that they have Scientific name: throughout Britain. As these plantations stored, using visual cues as a means of finding Garrulus glandarius developed, so they provided a new nesting each cache. Of course, some of the acorns are Family: habitat for the now recovering Jay population. not retrieved and germinate to form young Crows (Corvidae) Since then, Jay populations have fluctuated seedlings. Since Jays often bury the acorns somewhat, most recently showing a 10% outside of woodland they act as dispersal UK population: decline over the last 25 years (according to agents for the trees, helping oak woodland 160,000 breeding territories data collected through the BTO’s annual to establish in new areas. This is why some winter numbers unknown monitoring schemes). researchers have defined the relationship between the Jay and the oak as being an Conservation status: Green listed THE IMPORTANCE OF OAK example of symbiosis – the two organisms The breeding season diet of Jays includes a large sharing a mutually beneficial relationship. Migratory status: component of invertebrate prey, notably the Although not a symbiotic relationship in its Resident / winter visitor truest sense, it does highlight the strength of larvae of moths and beetles, many of which are Breeding: association between the two species. taken from the foliage of oaks. However, oak Clutch size: 4–5 eggs becomes even more important in the winter, Incubates: 18 days with the birds feeding on acorns cached the ON THE MOVE previous autumn. The dependence upon acorns explains why Young in nest: 20–23 days Caching behaviour begins in September, the normally sedentary Jay is prone to periodic Number of broods: 1 peaks in October and then ends abruptly long-distance movements. Occasional failures Breeding season: April–July as acorns supplies are exhausted. Jays from of the acorn crop over wide areas may give rise to Age at first breeding: 2 breeding territories scattered across the local mass movements of Jays (known as eruptions). area will converge on a piece of oak woodland These appear to be most pronounced within Typical lifespan: to collect acorns. Each bird will manage to the more northerly populations of Jays but they unknown carry three or four acorns, returning to its can result in significant influxes into Britain Max. recorded lifespan: own territory to bury them before journeying of birds from Fennoscandia and the near 16 years, 5 months back to the wood for another load. It has been Continent. The most recent large-scale influx estimated that each bird may cache upwards was in 1983, when there was an estimated www.bto.org/birdfacts of 5,000 acorns and, using this figure as an 90% failure of the acorn crop across much of average, the British Jay population probably Europe, including Britain. Jays were witnessed buries some 1,700 million acorns each year. In arriving off the sea at a host of coastal sites order to bury the acorns, the Jay uses its bill to along the south and east coasts of Britain. Jay foraging on the ground by Steve Round Bird Table 55 Autumn 2008 | ABOUT BIRDS Jay by Steve Round A VOCAL REPERTOIRE early April, directing their attentions towards ‘Jay’ was once a The harsh shrieking ‘kschaach’ call is the unpaired females. Various researchers have dismissive term used most familiar of the sounds made by the Jay also described a communal display, referred and it is this that gives rise to its Welsh name to as the ‘spring gathering’, where local birds to describe a loose of ‘Ysgrech y Coed’ (shrieker of the woods). (including some paired individuals) gather and woman or overly However, the species is also well-known for indulge in a relatively noisy get-together. Not flashy dresser. its ability to mimic the calls made by other all of the birds get involved since some remain birds and these are often worked into the rich spectators. The voice is also used to back up warbling song. Individuals have also been displays of aggression or, more tenderly, when known to mimic Man-made sounds, including participating in a bout of courtship feeding. trim phone, car alarm and motorbike (see Bird Table 53 for other examples of Jay mimicry). AN ADAPTABLE DIET Most of the mimicked sounds are delivered Like other members of the crow family, the with surprising accuracy and some, such as Jay takes a wide variety of foodstuffs, some of the chattering call of a Magpie, are usually which (notably young birds) land it in trouble so well delivered that they will fool even the with the shooting fraternity. For much of the most careful listener. Interestingly, mimicked year feeding activity takes place on the ground, calls are sometimes used when the birds are the bird foraging through leaf litter for beetles, agitated or feel threatened. The ornithologist other invertebrates and seeds. However, (and Jay expert) Derek Goodwin noted that during the breeding season most of the food any approach to an occupied Jay nest would is collected from the canopy of trees, with elicit alarm screeches interspersed with the leaf-feeding caterpillars and various beetles mimicked calls of predators (e.g. Tawny Owl, the favoured prey. Chief among the leaf- Sparrowhawk and domestic cat), together defoliating caterpillars taken in Britain are with the alarm calls of smaller birds (e.g. Song those of the genus Tortrix. These caterpillars Thrush and Blackbird). construct a ‘tent’ around themselves from a Voice is clearly an important component rolled oak leaf. of Jay social behaviour and calls are uttered The Jay, therefore, has to remove each in a wide range of social settings. Males, caterpillar individually. Jays are equally particularly young unpaired males, can diligent in their handling of beetles collected sometimes be heard singing in late March or for growing youngsters. Studies looking at 10 | Autumn 2008 Bird Table 55 JAY the prey delivered to Jay nestlings showed that large beetles, notably Cockchafers, are processed to remove the hard parts of the exoskeleton – essentially the wing cases, heads and legs. Cockchafers tend to roost on trees during the day and so it is easy to see why they are so readily taken by foraging Jays. It is also during the breeding season, when the Jay has young of its own to rear, that the eggs and nestlings of other birds may be exploited. In one particular study, carried out in northern Romania, Jays were found to be responsible for taking 16% of the eggs laid in 91 Song Thrush nests and 7.9% of the eggs laid in 77 Blackbird nests. A different study, this time carried out in Germany, reported higher levels of predation but the Jay population within the Jay by Jill Pakenham study area was unnaturally high because of the very large quantities of cereal grain available There is no doubt in my mind that this This pinkish brown in winter.
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