Concealed ovulation

Concealed ovulation means that when a female animal is able to have babies, there are no obvious signs that indicate when she is most fertile. This is different from many other animals, in which females have physical cues such as changes in body color, vocalizations, or smells which signify when they are ready to have babies.

In humans, concealed ovulation means that female bodies don't show obvious external changes when they are most likely to get pregnant. Unlike female animals, human females do not change in appearance, for example, there are no obvious signs like swelling, bleeding, or changes in behavior that happen during fertile periods. This makes it harder for males to know the best time to try to mate with females, and for females to signal to males when they are most likely to get pregnant. Because there are no obvious signs, humans must rely on social cues, like flirting and attraction, to signal their interest in reproducing.

So, in summary, concealed ovulation in humans and many other animals means that females do not have any special indicators when they are most likely to get pregnant, and that they must rely on other signals to convey their reproductive interest.