Editing Concealed ovulation (section)

{{Short description|Lack of visible changes in ovulating females}}
'''Concealed ovulation''' or '''hidden estrus''' is the lack of any perceptible change (e.g., a change in appearance or scent) when an adult female is fertile and near [[ovulation]]. Some examples of perceptible changes are [[sexual swelling|swelling and redness of the vulva]] in [[baboon]]s and [[bonobo]]s, and [[pheromone]] release in the feline family.  In contrast, the females of [[human]]s and a few other species<ref>{{cite journal | author=Sandy J. Andelman | title =  Evolution of Concealed Ovulation in Vervet Monkeys (Cercopithecus aethiops) | journal = The American Naturalist | volume = 129 | pages = 785–799  |date=June 1987 | doi = 10.1086/284675 | issue=6| s2cid = 83522515 }}</ref> that undergo hidden estrus have few external signs of [[fecundity]], making it difficult for a mate to consciously deduce, by means of external signs only, whether or not a female is near ovulation.
[[File:Sexual swelling in female Hamadryas baboon.jpg|thumb|[[Sexual swelling]] in a female [[hamadryas baboon]] indicates she is ovulating. Unlike other primates, female humans show no obvious outward signs of ovulation.]]