Weird mass on tracheal bifurcation - duck

[Mylied]

I processed two 18 week old ducks today. One had this hard hollow mass on it's trachea. I've done a whole lots of other birds and a few ducks. Haven't seen this before. Any clues what it is?

 

[MysteryChicken]

I processed two 18 week old ducks today. One had this hard hollow mass on it's trachea. I've done a whole lots of other birds and a few ducks. Haven't seen this before. Any clues what it is?View attachment 2204486

syringeal bulla
Look it up?

 

[Mylied]

syringeal bulla
Look it up?

Nice. I wonder why I hadn't noticed one before.

 

[MysteryChicken]

Nice. I wonder why I hadn't noticed one before.

I don't know either. I wonder if chicken's have this too.

 

[iwltfum]

I know it as a sryinx. It's how birds vocalize sound. Chickens do have one, they don't look like that though - they are much smaller and more symmetrically in line with the trachea and where it forks to the lungs. Cool! I've never seen one from a duck.

 

[casportpony]

I processed two 18 week old ducks today. One had this hard hollow mass on it's trachea. I've done a whole lots of other birds and a few ducks. Haven't seen this before. Any clues what it is?

Great picture!
https://www.backyardchickens.com/th...-reproductive-pictures.1296812/#post-21103193