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Blue tit in nest box

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Old Monday 24th December 2007, 13:16   #1
petecockney
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Smile Blue tit in nest box

I have had a single blue tit in nest box since last september.
My question is :- is it more likely to be a male than a female. I am unable to tell the difference between the sexes of a blue tit.
I thought it would likely be the male as he was perhaps looking after territory for next years hatch.
I would appreciate your views or knowledge.
Kind regards
Pete
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Old Monday 24th December 2007, 13:35   #2
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We had a male Great Tit that night roosted in the box for over a year, it even fought off all comers during the breeding season. I think it just wanted it as a bachelor pad.

With BTs the male is supposed to have a broader stripe at the back of the head.
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Old Monday 24th December 2007, 15:10   #3
petecockney
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Thanks Marmot
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Old Monday 24th December 2007, 21:49   #4
KnockerNorton
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It could be a male or female. Both will roost in boxes (though they both usually prefer smaller cavities as they can warm up the air around them more quickly - a box has quite a large airspace inside, and isn't as cosy at their usual prefered roost sites). The female may roost in the box that she will later nest in, but usually they try and avoid this because they build up droppings in their roost sites, and naturally they want a clean nest site that will not attract predators (smell) or disease. But sometimes they don't have much choice, especially in suburban gardens where there aren't many natural cavities for them.

It can be very difficult to sex blue tits. Trying to sex a lone bird is unreliable, and features such as width of head band and blueness of cap/wings are only really useful when you compare a pair at the nest, when you know you have a male and female. First years are even more tricky, as they're not as bright. And suburban birds are another problem - they're duller than country birds. So it makes it too difficult to tell, really. Many ringers insist that you can sex blue tits fairly reliably. But I think that's maybe an overinterpretation of the criteria in the literature. I have been assured by someone who has compared many hundreds of pairs that it is very difficult indeed.
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