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the leghorn was old! and the Buff was not even 1 yet.
and BTW
Welcome to BYC
It may just be heart failure. I've heard a lot of folks finding a dead bird in the morning like that with no other symptoms and found that it was just a plain old heart failure issue (rather than a disease). One of the guys here on byc said he found that around the 8 month mark was when his cockerels would die of heart failure if they were going to have it.
The only way you could tell is to do a necropsy and see what you find...and I know a lot of folks won't want to do that.
I had never even considered such a thing until "hanging around" with some of the folks here that have kept chickens for years that encouraged us to do it for several reasons. One is to be able to recognize what is healthy and what is not....and to be able to see and learn signs of disease vs. genetic abnormalities.
And I've gained so much knowledge from the photos others have posted when they've done a necropsy - either for others to look at and comment or if they labeled them and commented themselves.