No, when I was growing up, chickens were much smaller. They’ve been bred over the years to be be much larger with (supposedly) stronger legs to hold the larger breasts. They’re now 50-75% larger than in the 1950s.
This is from the National Chicken Council site, which isn’t going to give you any information that is detrimental to themselves, but this pic can give you an idea of the difference in the last 60-70 years.
