The hormone that maintains the secretory activity of the corpus luteum as well as the increase in the size of the mammary glands is

Mark the incorrect statement.

For what primary purpose is the call of the cuckoo heard during the rainy season?

The $Oestrus$ cycle is a characteristic of which of the following?

Which of the following statements are correct regarding the female reproductive cycle?
$A$. In non-primate mammals,cyclical changes during reproduction are called the oestrus cycle.
$B$. The first menstrual cycle begins at puberty and is called menopause.
$C$. Lack of menstruation may be indicative of pregnancy.
$D$. Cyclic menstruation extends between menarche and menopause.
Choose the most appropriate answer from the options given below.

The female rabbit is: