Pied Wagtail Feeding in a Silver Birch Tree

In our front garden we have a weeping silver birch Betula pendula, which stands about 4m tall. The crown of the tree is a matted tangle of branches and twigs, which by early November was mostly devoid of leaves while the ‘weeping’ branches still retained many.

Remembrance Sunday 2012 was a fine autumnal day, starting frosty with clear blue skies and almost no wind. At 09:10, by which time the frost had mostly melted, I noticed a winter plumaged Pied Wagtail Motacilla alba yarrellii walking about on the crown of the silver birch. It stopped often to peck at branches and more frequently at the remaining leaves, sometimes pecking five or six times at a single leaf. BWP categorises this type of foraging as ‘picking’ (Cramp 1988). The Pied Wagtail foraged in the tree for more than five minutes, only leaving when two juveniles flew over, calling. The adult bird followed them to a nearby flat roof where they stood, each calling. After a brief while the juveniles flew off and the adult returned to the crown of the silver birch and resumed foraging. At this point I went to get a camera, but when I returned the Pied Wagtail had disappeared. Blue Tits Cyanistes caeruleus and Great Tits Parus major were present in the silver birch at the same time, moving through and apparently feeding from the ‘weeping’ branches.

I was away from home on 12-14 November 2012. Subsequently, a Pied Wagtail was noted foraging in the crown of the silver birch on two further occasions. On 15 November, it was first observed, already in the tree, at 13:30 and stayed for about 30 minutes. During this time it briefly flew off and returned three times. Once it was accompanied by a second, winter-plumaged Pied Wagtail but this bird did not stay long and did not forage. On 17 November it was first observed at 11:57, again already in the tree and it remained until 12:24 when it was disturbed by a car passing by. For six minutes, between 12:03 and 12:09, it perched on a branch at the top of the tree. During this time it was mostly still, not even wagging its tail. For the remainder it was actively foraging on the crown of the silver birch.

Photographs were taken of the wagtail on both 15 and 17 November. Comparison of the images suggests it is the same bird foraging on the crown of the silver birch.

Although less than 10m from where I was watching with 10x binoculars, I could not see what the Pied Wagtails were feeding on. Nor could I find any obvious prey items on closer inspection of the leaves.

I had previously recorded both Pied Wagtails and Yellow Wagtails Motacilla flava flavissima perching in the silver birch but this is the first time I have noticed foraging activity. Various other species have been recorded foraging in the tree, e.g. Blue Tit, Great Tit and Goldcrest Regulus regulus but these were usually on the ‘weeping’ branches. Starlings Sturnus vulgaris are the only other species noted foraging on the crown, when in the summer months, they feed on aphids.

BWP records Pied Wagtails foraging on the ground, floating vegetation and on the backs of pigs but does not record them foraging in trees (Cramp 1988).

Cramp, S. (ed.). 1988. The Birds of the Western Palaearctic. Vol 5.

Originally published in The Hobby 126: 17-18

Clerical Oversight and Elusive Ton

On 26 September 2012 I noted a lone Lapwing flying north over the fields near Poppy Hill Farm. I did not realise at the time that this was the first I had seen on my local patch this year and did not add it to my Self Found Year List (SFYL).

When the Self Found Year List (SFYL) challenge was made in March 2012 I decided I would concentrate on my local patch of Henlow Grange as I knew I did not have the time nor, possibly more importantly, the energy to compete with the big boys. By the time the challenge was issued, I had already recorded 70 species, of which 52 species had been found on New Year’s Day. I quietly set myself the target of 100 species, a target I hoped to reach by the end of the spring migration.

Henlow Grange is in east Bedfordshire, immediately east of Henlow village. My local patch includes the area around the Grange, stretching from the A507 in the south to Langford village in the north. The East Coast Main Line forms the eastern boundary while Henlow village and the River Ivel are on the western edge.. This area falls in atlas tetrad TL13Z and comprises two 1km squares TL1838 and TL1839. The River Ivel and its tributary the Hiz flow from south to north with disused gravel pits, now converted to fishing lakes, alongside. Sadly, none seem particularly attractive to waterfowl. There is some woodland in the grounds of Henlow Grange, not open to the public, and along the banks of the river including small conifer and poplar plantations. The fields east of the river are mostly arable, growing oil seed rape, wheat and barley with some areas of set aside and a few remnant hedges. This area supports a reasonable population of farmland species, including Corn Buntings, Yellow Hammers, Linnets and Yellow Wagtails.  Alongside the railway are some horse paddocks with short cropped grass which are favoured by thrushes and Starlings during the winter months and Wheatears and wagtails on passage. It is possible to walk a loop round Henlow Bridge Lakes in the south and another loop round the fields in the north, but there is only the one bridge over the River Ivel. I usually walk either the southern loop or the northern loop, preferring the latter as there is less disturbance from the traffic noise generated by the A507.

NERVOUS NINETIES: By early May I had recorded 90 species including most of the common summer migrants and was looking forward to notching the elusive ton. Another five species, Garden Warbler, Lesser Whitethroat, Cuckoo, Sedge Warbler and Hobby were added in mid-May, all summer migrants that had been recorded elsewhere in the county up to 10-days earlier. A pair of Shelduck flying over and a single Spotted Flycatcher in the lime tree avenue leading to the Grange were the only additions in June. And then nothing new until the end of September. I tried hard to turn fly over gulls into the Yellow-legged variety but lacked the conviction to make a confident id. I scoured the remaining hedgerows hoping to turn up a migrating Redstart but to no avail. A pair of Ravens, cronking as they flew west took the tally to 98 or so I thought.   

Only when extracting data from BirdTrack to write an article titled ‘Nervous Nineties’ did I realise that the lone Lapwing had not been includied in my local patch total. This clerical oversight meant that the adult Mediterranean Gull seen on 25 October, which I originally thought was number 99 became number 100. Not a bad way to bring up the ton!

Highlights of the hundred have been the Woodcock flushed from beside the track on a snowy morning; the male Merlin perched on the wires, which I originally thought was a Mistle Thrush until I lifted my binoculars (my excuse is my glasses were misted with the rain); the spring passage of Wheatears on the horse paddocks with associated Whinchats and the pair of Kingfishers nesting along the River Ivel.

There are a few species recorded in previous years that I have yet to see this year, so hopefully still a few more for the list.

Sparrows Eat Beetroot

Only during the breeding season do House Sparrows Passer domesticus visit our Henlow garden in numbers. At this time of year family parties appear, usually comprising one adult, either male or female, and their brood. This year the first family, a female with three young was first noted on 14 June 2012, a couple of weeks later than in previous years. Subsequently, numbers have risen to a maximum of three males, three females and 12 young, presumed to be three broods of four chicks. At first the fledglings hide in the shrubbery only noisily appearing with wings quivering when the parent approaches with food, but perch more in the open as they become bolder.

On 14 June 2012 a female House Sparrow flew to our vegetable patch rather than the seed feeders and pecked at the leaves of beetroot. I assumed she had been picking an insect from the leaf. That evening while watering the garden, I checked the beetroot. I could find no insects on any of the beetroot leaves but small pieces had been torn from the leaves on one plant. The following day, I watched more carefully, and a female House Sparrow was seen to nip out pieces of beetroot leaf and, apparently eat them. Over the following four days, the leaves were stripped from this beetroot plant. The female House Sparrow fed at least one of the fledglings immediately after nipping out a piece of leaf and later the young birds were also seen feeding on the beetroot leaves. I could not tell if only one female and brood were involved. No males were recorded feeding on the beetroot leaves. Only one plant in the row of beetroots was attacked this severely although the leaves of other plants had been nibbled.

BWP (Cramp & Perrins 1994) records that House Sparrow regularly attack flowers and green leaves, but is not certain these are eaten.

Cramp, S & C.M.Perrins (eds) (1994). The Birds of the Western Palearctic Vol VIII.

 

Originally published in The Hobby 124: 11