Tuesday 23 September
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| Nutcracker Nucifraga caryocatactes |
After arriving late and in the wet at my friend Marieke's summer cottage in the Belgian Ardennes late on Monday evening to join her and do some "Nutcracker searching," Tuesday started off dry and calm with broken cloud. Time to enjoy a late breakfast and looking out through the very large picture window at the fields and hedgerow I was able to enjoy the many feeding Black Redstarts and Chiffchaffs which were later joined by Blue Tit, Robin and Blackcap. Even a passing Carrion Crow and Magpies.
Breakfast over and the car loaded and we were off to one of Marieke's favourite sites in the hope that the Nutcrackers, member of the corvid family, would still be about and seeking out the necessary food to see them through the coming winter and spring. Marieke has been visiting the area for the past thirty years and observing the behaviour of the Nutcrackers and since taking advantage of her new country property begun an intensive study of the life and times of the Nutcracker and must, surely, be the go-to expert on the Belgian Nutcrackers. So what is special about the Belgian Nutcracker?
has been visiting the area for the past thirty years and observing the behaviour of the Nutcrackers and since taking advantage of her new country property begun an intensive study of the life and times of the Nutcracker.
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There was always a very small population of Nutcrackers in the Ardennes as it offered an ideal feeding and breeding habitat but, just as visiting Waxwings in the UK and elsewhere, every so offer the food crop fails and we get an irruption of birds out of their natural habitat seeking alternative food sources. In this case, such a large irruption took place in Siberia in 1968/69 with the main Nutcracker (Nucifraga caryocatactes macrorhynchos) flocks moving to Switzerland, which already held the European Nutcracker (Nucifraga caryocatactes) species feeding exclusively on the seeds of the stone pine and hazelnuts. However, the Siberian sub-species with its slightly thinner and shorter beak apparently survived only on the pine seeds. Not only Switzerland as the Siberian Nutcrackers were also recorded in most western European countries including the UK. It is probably true to say that most of these immigrants either perished or tried to make their way back to their homeland but, at the same time, many of the Swiss birds also moved north and found their ideal habitats in the Ardennes; hilly mountains with abundant hazelnut trees and unmanaged pine forests. These birds, therefore, expanded the existing small population and their descendants can still be found today, albeit in reducing numbers as the above pine forests are managed, both by tree felling and clearing of the undergrowth and lower branches of trees to increase growth before harvesting.
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| Hazelnut selected and ready to add to crop |
Why is this important? Like both the Jay (which lives on acorns) and Red Squirrel, the Nutcracker survives by collecting hazelnuts and then creating caches to provide a food source once the crop is cleared. But unlike the other species, the Nutcracker not only manages to store up to 15,000 hazelnuts a season but seems also to be able to remember the site of every single cache. What sort of memory, organisational plan has this bird been able to develop? This means very active work during August and September when the birds fly away from their home territory in the pine woods travelling up to 3 kilometres and able to store up to 15 nuts in their crop before returning home, crop bulging just as we often see with pigeons in our own localities. Once back in the woods, the Nuthatch will excavate a small hole of up to three to five centimetres deep in the soft undergrowth in which the bird will stash up to three nuts. Every breeding couple needs to gather around 28,000 nuts! This food stock has to feed both adults and then maybe as many as three young through the breeding season until the following July when other food stocks might become available. But, even more important, the food has to be available all winter and the Ardennes has regular heavy snow covering the ground. The Nutcracker can excavate through a light covering of snow so, therefore, their home territory needs protection from heavy snow coverage, hence the use of pine forests which have not been cleared or managed.
Unmanaged conifer plantation with ground cover
Managed conifer plantation, exposed and no ground cover and unsuitable for breeding Nutcrackers
Naturally, this means as pine enclosures are harvested/cleared the resident birds need to find alternative, untreated sites. The more that are cleared the fewer opportunities for occupation, so controlling the extent to which the existing Nutcracker population can multiply.
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| Searching for a healthy hazelnut |
As for the Nutcrackers' nests, they are usually at the top of a pine tree in the greenery and from a study undertaken in the 1990s suggesting the birds were more abundant and were found nesting in smaller trees and, therefore, much nearer the ground that the nest shown to me by Marieke.
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| Nutcrackers' nest high in the pine tree |
And so to our first visit a few kilometres away from Marieke’s home. Upon arrival almost immediately a couple of overflying
Nutcrackers were sighted and, maybe, this was to be the nearest we were to get
to the birds. But, no, Marieke had other ideas. She took me to a site near some hazelnut trees that had produced foraging Nutcrackers last week. A site which has been kept "secret" to avoid mass interruption from photographers and unnecessary interference from visitors.
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| Arrival of the Nutcracker |
Settling down quietly and under cover I then had the pleasure (privilege!) of seeing a Nutcracker arrive and pose at the top of a tall tree not 20 metres away. The bird even patiently sat and preened which was, according to Marieke, a behaviour she had not seen before, given that once the bird had gathered its crop full of hazelnuts it then had to fly uphill to its breeding area which might be up to three kilometres away.
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| And then the Nutcracker started preening |
However, not only did the bird remain for many minutes but then flew to the hazelnut tree immediately in front of us giving even better views, followed by a short stop on the grass below to pick up a nut that it had, presumably, dropped whilst foraging above.
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| Nutcracker retrieving a dropped nut |
Whilst stating that the bird gathers up to 15 individual nuts on any foray down to the hazelnut trees, it does not simply pluck nuts off the branch. It is very selective and carefully assesses each individual nut by weighing it in some form of way to establish that the shell contains a healthy, well-developed nut. Too light and the bird instinctively knows that either the nut has not properly developed or has been infested in some way. These nuts are immediately discarded. Searching below the trees you will find a selection of shells including some halves, indicating that the bird is also feeding on healthy nuts, as well as smaller discarded nuts some of which will also show a small hole indicating that the nut has been infested. Again, an amazing activity undertaken by these incredible corvids.
But that was not the end of our little adventure. Making our way back from the thirty minute walk to the latest plantation we were regularly in contact with Jays giving their alarm call indicating that strangers are present and then, stepping off the track into the open pine plantation, I saw black shape near the base of a pine tree not twenty metres away. I thought at first it was a Red Squirrel, given that the Spanish species always appeared black rather than red, and then the shaped moved slight up the trunk revealing its total blackness other than a bright red crown confirming that I was looking at my very first Black Woodpecker. What a sight; such a size and appearing almost twice the size of our native Green woodpecker. How lucky and what a privilege and pleasure to see both Nutcracker and Black Woodpecker on my very first day with Marieke.
Just a thought; in addition to the birds seen today there was no shortage of a range of fungi in the damp woods, and giant toadstools some of them appeared to be, including the Amanita Muscaria, commonly known as the fly Agaric or Fly Amanita as shown below.
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| Amanita Muscaria or Fly Agaric |
Birds seen:
Red Kite, Woodpigeon, Great Spotted Woodpecker, Black Woodpecker, Robin, Black Redstart, Blackbird, Blackcap, Chiffchaff, Blue Tit, Nuthatch, Jay, Magpie, Nutcracker, Carrion Crow, House Sparrow, Chaffinch.
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