Bird Nest?

n5750547

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I've seen a lot of these around and was wondering what kind of nest it is. Most of the ones I saw were about 8cm long and on the tips of small tree branches.



Cheers
Phil
 

Aussie123

Never Alone In The Bush
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Its a gall created by a wasp or fly.

The critter drills into the bark and lays larvar or eggs. These irritates the plant causing the gall.
 

n5750547

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Didn't expect that. I assumed it was probably just some dirt that had been put there by some nest builder. Thanks for the info
 

n5750547

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From the few articles I have found it seems like no-one knows the mechanism which causes them to form, even when they know what/who is responsible. Any ideas or links to how it might happen?
 
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