I had a hen (barely, she was like 12.5 months) that passed rather suddenly. Looked inside, and her heart was quite a bit smaller than it should have been. Never would have guessed that issue, let alone any issue for her
Okay. They way you had said hybrids vs pure breeds made it sound like you were claiming about any bird that wasn't a purebred would live shorter than any purebred
My oldest are 11 or 12 now. I have one from thar group left. Next oldest are either 10 or 11, currently have two left, but in a few days it will be one left based on how my gal is slowing down