Humans have menstrual cycles rather than oestrous cycles. They, unlike most other species, have concealed ovulation, a lack of obvious external signs to signal estral receptivity at ovulation (i.e., the ability to become pregnant).

What is the estrous cycle in humans?

The first proestrus, estrus, metestrus and diestrus then follow. Metestrus only occurs in the absence of conception [6]. On the other hand, in humans, there are three phases of the menstrual cycle; the menstrual, proliferative (follicular), and secretory (luteal) phases. This cycle begins at puberty.

Why do humans not have estrus cycle?

Human females

Humans are considered to have concealed ovulation because there is no outward physiological sign, either to a woman herself or to others, that ovulation, or biological fertility, is occurring.