Chickens have changed a lot in the last 50 years as well. This 2014 paper [0] compares the growth of chicken breeds from 1957, 1978, and 2005. The pictures of c

Chickens have changed a lot in the last 50 years as well. This 2014 paper [0] compares the growth of chicken breeds from 1957, 1978, and 2005. The pictures of chickens at 56 days are pretty striking. [0] https://www.sciencedirect.com/science/article/pii/S0032579119385505?via=ihub https://www.sciencedirect.com/science/article/pii/S003257911...