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House martin mustering at Sizergh Castle

2/9/2023

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PictureHouse martin muster on the tower at Sizergh Castle
The chatter of house martin fills the air as they fly  in a whoosh and settle high on the castle wall,  on narrow ribs on the stone tracery within a window, in a shallow shelf above lead guttering and in niches in the stonework.  House martin cling to the stone,  showing their white feathered legs and feet.  Dark pointed wings poke up from a narrow shelf.  Birds half-hidden  cling close to the stone offering odd perspectives.  This isn't a high-wire or parapet line-up with classic poses, it's much more quirky- like sea-birds crammed onto cliff- ledges. 

 On 7th July hirundines flew low over the lawn below the castle, swallows I thought.  I discovered a house martin nest and a swallow nest in close proximity, both with nestlings being fed by the adults.   
On 18th August both house martin and swallow nests were silent and there were few hirundine in flight about the castle.
Today,  2nd  September, house martin are gathering in a large pre-migratory flock and it's thrilling.  They settle high on the south-facing facade of the castle and on this sunny  morning their bright white plumage shows against the  the limestone, pin-points of gleaming white against grey.  The rough façade of stone resembles the cliff-faces where  once house martin built their nests.   A few clumps of daisies that spill down the castle steps have have set-seed  high on the castle wall, with clumps of lichen.  What are the house martin doing up there?  Zooming-in on my images I can see some are preening.  There will be insects in that rough stone facade so will they take them, or feed only on the wing?
High on the parapet a  brownish immature house martin sits alone.  There will be other young birds but they're high on the castle wall and hard to distinguish.    Something startles them and the flock erupts in a whoosh, then all is silent for a while, until they return in an urgent volley of flight.
My images of the day remind me of Breughels’  painting, Children’s Games, where there are quirky and perplexing things going on.   Some  birds cram themselves into niches half out of sight, the game is to find them and interpret their behaviour. 
In July house martin and swallow were nesting close to each other. No sign of swallows today, I wonder where they’ve gone. And how many of today’s gathering house martin nested here at the castle.  The changing behaviour and mix of hirundines through the breeding season is fascinating, and unresolved. 
Apparetnly, house martin can have two or sometimes three broods and it's not unusual for there to be young birds in early September.  But the nests I can see are silent.  I wonder how a wet July and August affected late broods. 
 At Sizergh a gentleman looks up to the tower,  notices the house martin and  remembers Duncan and Banquo arriving at Macbeth's castle
Macbeth. Act 1 scene vi. 
This guest of summer,
The temple-haunting martlet, does approve,
By his loved mansionry, that the heaven’s breath
Smells wooingly here: no jutty, frieze,
Buttress, nor coign of vantage, but this bird
Hath made his pendent bed and procreant cradle:
Where they most breed and haunt, I have observed,
The air is delicate 
I've known the play as long as I can remember but I begin to realise that there is bird-lore hidden within Shakespeare's work.  Almost casually, he is telling us that colonies of house martin  build their nests on church towers and that it's a habitual  and a welcome  sight. In  the late 17th century numbers look good. 
I wonder if anyone knows the natural history of hirundine at Sizergh Castle, how long these birds have been the guests of summer here and whether they're  recorded  in the Annals of Sizergh Castle.  
The garden looked lovely, as always. But this house martin muster was novel and I was captivated by it.   A comma butterfly settled in the sun, wings open, in a spot where one appeared the same time last September, where ivy hangs over the wall. 
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    Jan Wiltshire is a nature writer living in Cumbria. She also explores islands and coast and the wildlife experience. (See Home and My Books)

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