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Albatrosses: “divorce” rates and; eggs of; parental care and

Alexander, Richard

Alligators, parental care and

American men, role of

Amphibians: external fertilization and; parental care and; vivipary and

Anatomical adaptations, natural selection and

Andaman Islands, fat in women of

Andelman, Sandy

Androgens; male pseudohermaphrodites and

Animal signals; age indicated by; auditory; behavioral; in birds; electrical; experimental study of; Fisher’s runaway selection model of; gender indicated by; male sexual ornamentation and; natural selection and; olfactory; sexual maturity indicated by; truth in advertising theory of; Zahavi’s handicap principle of

Antelope, mating systems of

Anticontraceptive theory, of concealed ovulation

Ants, signals and

Apes: aging and; humans compared to; ovulatory signs and; penis of; promiscuous mating system of; sexual distinctiveness and. See also Bonobos; Chimpanzees; Gibbons; Gorillas; Orangutans

Archaeopteryx

Arctic Indian men, hunting by

Arctic seals, lactation and

Asian elephants, menopause and

Auditory signals

Axillary hair, sexual maturity in humans indicated by

Baboons: ovulatory signals and; sex confined to estrus and

Baleen whales, eggs of

Bandicoots, pregnancy and

Barbary macaques: public sex and; sex confined to estrus and

Bats, mating systems of. See also Dyak fruit bats; Hammer-headed fruit bats

Battle of the sexes. See under Parental care

Behavioral signals

Better-genes-through-cuckoldry theory, of female sexual receptivity

Big-bang reproduction (semelparity)

Bipotential gonad

Birds: coparenting and; evolutionary commitment of; internal fertilization and; mating systems of; pair bonds formed by; parental care and; on Rennell Island; sex for fertilization and; sex-role-reversal polyandry and; signals and

Body fat. See Fat

Body signals. See Signals

Bonobos (pygmy chimpanzees): humans compared to; menopause and; promiscuous mating system of; sex for fun and

Bowerbirds, golden crest of

Breast-feeding. See under Lactation

Breasts: hormones and development of; as signal in human females

Bride prices: confidence in paternity and; women’s desirability and

Brown, James

Brush turkeys, parental care and

Buttocks, as signal in human females

Century plants, big-bang reproduction and

Chaperoning, confidence in paternity and

Chickens, large eggs of

Childbirth, risk of mother’s death and

Child care. See under Parental care

Chimpanzees; humans compared to; infanticide and; lack of paternal care and; menopause and; ovulatory signals and; penis of; private sex (consortship) and; promiscuous mating system of; public sex and; pygmy, see Bonobos

Chromosomes

Circumcision, female. See Clitoridectomy

Clitoridectomy, confidence in paternity and

Clitoris

Comparative method, concealed ovulation studied by

Concealed ovulation; anticontraceptive theory of; comparative method studying; daddy-at-home theory of; detecting ovulation and; evolution of; female receptivity and; harems and; hormonal test kit and; many-fathers theory of; mating systems and; paternity confused by; prostitution theory of; theories explaining

Confessions of Felix Krull, Confidence Man (Mann)

Confidence of parenthood: concealed ovulation and; daddy-at-home theory of concealed ovulation and; genetic testing and; male lactation and; many-fathers theory of concealed ovulation and; parental care and

Conflict of interests: between closely related people; in hunter-gatherer societies

Consortship, chimpanzees and

Coparenting: birds and; daddy-at-home theory and; humans and; male lactation and; sexual receptivity and

Couples, humans forming

Cows, hormones and lactation and; virgin cows and

Daddy-at-home theory, of concealed ovulation

Darwin, Charles

Deer, antlers of

Dihydrotestosterone; male pseudohermaphrodites and

Dinosaurs

Divorce; human signals and

Dogs: mammary glands and; sex for fertilization and; signals and. See also African hunting dogs

Dolphins, sex for fun and

Dyak fruit bats, spontaneous male lactation and

Echidnas, internal