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Bat, Wrens & the Martins’ Nest

Windows

Old Oak
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The other day my wife left a window without a screen open past dusk and a bat flew in.

Possibly it was the same one that had come inside a week earlier when I’d left the door open. On that occasion, the bat decided at one point to scuttle along the floor and I gently picked it up in a pillow case and deposited it safely outside.

This time, however, the bat was highly energetic and just kept circling the room. My wife bravely volunteered to go outside to tell me when it had exited and I put on my bee suit (don’t ask) to better prepare for encouraging its exit.

After minutes of fruitless hopping about and waving a pillow case at it so that it would exit the way it came in, I realised that opening the skylight would increase my chances. Thirty seconds later it was gone.

Meanwhile outside, my wife had discovered that three or four wrens were living in the martin’s nest under the eaves. Unfortunately no pictures, but very cute. I had no idea that wrens would reuse other birds’ nests nor that they would be nesting as a group in winter. I thought that wrens built their own nests and that they kicked the kids out soon after fledging. Maybe this is a group of adults? Anyone know anything about wrens?
 
You've got to be very careful with these situations. Handling a bat (even in a rescue situation) requires a licence, believe it or not. The easiest way is to shut the internal door, turn the light off, and open all the external windows. They'll find their own way out.

As for the wrens....they've no chance of raising a brood this early.
 
Some birds - like the wrens - will take shelter in nest boxes during winter months. Providing "Roosting boxes" - with holes lower down so warm air is trapped - can he helpful to our little feathered friends... different to nest boxes but some birds will make use of what there is. Google 'roosting boxes' for clarity.
 
What Frank said.
The small birds will huddle together for warmth in whatever box they can find and there can be 20 or 30 blue and other tits together in a small roosting box. We have a swallows nest undet the covered area at the back and I know wrens use that. The birds are looking for nesting sites now but it will be a few weeks before they start building and fighting over them.

I found out about the bat licence rules over 40 years ago when my daughter rescued a pipistrelle on the school bus home. She put it in a pencil case, I put it on the house wall when it got dark and it didn't move so I spent a couple of hours catching moths and feeding it with tweezers. It didn't fly away so I called the RSPC the following morning and got a lecture when they collected it. Seems they would rather it had been left to die on the bus. :(
 
Did you make the martins nest box?
I would like more boxes dotted around the garden but we have a grey squirrel problem.
I am ok where bluetits are concerned as the hole is small and reinforced.
 
Did you make the martins nest box?
I would like more boxes dotted around the garden but we have a grey squirrel problem.
I am ok where bluetits are concerned as the hole is small and reinforced.
The martins made it from mud in 2024. It’s probably only 10’ off the ground - under ground floor eaves. They definitely had live young 2024, but I don’t think it was used 2025. They had made another one higher up on the other side of the house (before 2024) which was in use again in 2025.
 
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I saw lots of bats whilst caving, years ago. No big 'Batman-style' roosts, but individuals or small groups, usually close to a cave entrance and wrapped up in their wings, hanging from the ceiling.

We had to be careful not to stand directly beneath them, as our body heat could bring them out of hibernation too early, with insufficient insects around for them to not starve.

"Winter Watch" last month had several clips from viewers, of wren takeovers of nest boxes. The working hypothesis is that they do this to share their body warmth. One of the presenters mentioned at the time the current highest recorded number and it was huge - possibly 60 individuals at one time. It'll be on iPlayer, but I can't remember which episode - possibly the last one...

[slightly later/] Google is my best friend:
The highest recorded number of wrens in a single nestbox is 61, observed in Norfolk, England, during the winter of 1969. Wrens are known to form these large, communal, and often temporary, winter roosts to share body warmth and survive, particularly in extreme cold, as shown by the RSPB, BTO, and Vine House Farm. Other reports have occasionally cited 60 or, in some, slightly higher figures, but 61 is the generally accepted, cited record for this behavior, notes Great British Life and BBC Wildlife Magazine.
 
The martins made it from mud in 2004. It’s probably only 10’ off the ground - under ground floor eaves. They definitely had live young 2004, but I don’t think it was used 2005. They had made another one higher up on the other side of the house (before 2004) which was in use again in 2005.
I thought it might have been an artificial one
😆
 
Did you make the martins nest box?
I would like more boxes dotted around the garden but we have a grey squirrel problem.
I am ok where bluetits are concerned as the hole is small and reinforced.
It’s a pity you are so far away. When we arrived here we were overrun by them. The previous owners used to feed them. Not any more.
 
I saw lots of bats whilst caving, years ago. No big 'Batman-style' roosts, but individuals or small groups, usually close to a cave entrance and wrapped up in their wings, hanging from the ceiling.

We had to be careful not to stand directly beneath them, as our body heat could bring them out of hibernation too early, with insufficient insects around for them to not starve.

"Winter Watch" last month had several clips from viewers, of wren takeovers of nest boxes. The working hypothesis is that they do this to share their body warmth. One of the presenters mentioned at the time the current highest recorded number and it was huge - possibly 60 individuals at one time. It'll be on iPlayer, but I can't remember which episode - possibly the last one...

[slightly later/] Google is my best friend:
Absolutely correct. A short clip of a nest with multiple wrens in Winterwatch Series 14 Episode 4 at 28:41. Thanks!
 
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