True or False: In most mature female chickens, the left ovary and left oviduct are fully developed.

In most mature female chickens, it is true that the left ovary and left oviduct are fully developed. Chickens, like many birds, typically have only one functional ovary and oviduct, which is the left side. The right ovary and oviduct usually regress and do not develop, resulting in the left side being the primary reproductive system when the chicken reaches maturity. This anatomical specialization allows for efficient reproduction, as the hen can produce eggs that travel through the left oviduct to be laid. In summary, the thorough development of the left ovary and oviduct is a distinctive feature of mature female chickens, which supports the statement's accuracy.