Share This Author
A biological theory of reinforcement.
Aggression decreases as play emerges in infant spotted hyaenas: preparation for joining the clan
Abstract The early social development of spotted hyaenas, Crocuta crocuta , is marked by a dramatic transition at 2–3 weeks of age, when infants are taken from the isolation of their natal den, where…
Perseverative neural processes and consolidation of the memory trace.
- S. Glickman
- BiologyPsychological bulletin
- 1 May 1961
Curiosity in zoo animals.
The reactions of more than 200 zoo animals to a standardized set of novel objects were recorded and quantified. Our results indicated significant differences among various taxonomic groups, both in…
Fatal sibling aggression, precocial development, and androgens in neonatal spotted hyenas.
Spotted hyena females are strongly masculinized, both anatomically and behaviorally, apparently by high levels of androgens during ontogeny, and Neonates display elevated androgen levels, precocial motor development, and fully erupted front teeth.
Non-invasive monitoring of fecal androgens in spotted hyenas (Crocuta crocuta).
A mechanism for virilization of female spotted hyenas in utero.
The limited aromatase activity may allow the hyena placenta to convert high circulating concentrations of androstenedione to testosterone, which results in virilization of the fetal external genitalia and possibly destruction of fetal ovarian follicles.
Hormonal correlates of 'masculinization' in female spotted hyaenas (Crocuta crocuta). 1. Infancy to sexual maturity.
- S. Glickman, L. Frank, S. Pavgi, P. Licht
- Biology, MedicineJournal of reproduction and fertility
- 1 July 1992
Gonadectomy (two males and four females) at 4-7 months resulted in nondetectable concentrations of testosterone and oestrogen and a marked attenuation in androstenedione, indicating that the gonads are the major source of these three steroids.
Testis-like steroidogenesis in the ovotestis of the European mole, Talpa europaea.
Seasonal variation in plasma testosterone concentrations are presented, which parallel the growth and regression of the "testicular" interstitial gland, in T. europaea, and selective metabolic production of testosterone from radiolabeled steroid precursors by these ovarian interstitial tissues and male testes is revealed.