"The nest is a deep cup that follows the natural look of the plant. The upper, shinier surface of the leaf faces outwards so there is no contrast in exterior. The nest faces the same direction that the leaves grow, so if the plant has a natural downward disposition, it stands vertically, and if the foliage stands out horizontally, so does the nest.
The edges of the threads act like rivets, holding the leaf edges together. The stitches don't unravel, thanks to the coarseness of the thread and elasticity of the leaf springing back to grip the thread passing through the holes. A single nest can contain between 150 and 200 stitches ... so skillfully put together that it is almost impossible to tell it apart from its surroundings.
The real nest, however, lies within the sewn cup. The male collects and fills the cup with fine grass and lines the sides with other soft material such as animal hairs and plant downs.
'There's a whole range of materials birds can employ such as botanical and animal material,' says Douglas. 'The materials they utilise will offer different properties and birds often consciously choose those materials based on that.'
Tailorbirds often use feathers and fur to fill the leaf cup, because those materials tend to insulate the nest better than anything else. Green plant material is also used, which helps with thermoregulation and reduces the possibility of parasites such as lice."
Thanks to @sohkamyung for the source: https://www.nhm.ac.uk/discover/the-bird-that-stitches-its-home.html
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