This period includes the first three months of the peak-breeding season (Austral spring, Sep-Nov), when conceptions (as indicated by births, given a 12-month gestation period), the duration of female 'attractive periods' (based on the duration of single and consecutive consortships) and 1st-...
Chilvers BL, Roberton BC, Wilkinson IS, Duignan PJ, Gemmell NJ (2005) Male harassment of female New Zealand sea lions, Phocarctos hookeri: mortality, injury, and harassment avoidance. Can J Zool 83:642-648Chilvers, B. L., B. C. Robertson, I. S. Wilkinson, P. J. Duignan, and ...
Male lions are a bit of a mixed bag when it comes to fathering. 谈到父性,雄狮有点好坏参半。 To find the name of a plant species it is often necessary to have a close look and count the male and female organs in the flowers. 仔细观察并认真数花的雄性雌性器官的数量,这对于找出一种...
The environmental threat only had a weak effect on preferences for facial femininity-masculinity: women found feminine male faces more attractive under pathogen threat, while men found feminine female faces more attractive under resource threat. This is in contrast to some previous studies, and shows...
and stal lions generally visit each premise twice per week with a 3 or 4 day interval between visits approximately 20 days after the last mating the stallion is brought back to deter mine whether the mare has returned to oestrous veterinary assistance rarely is used in this system high ...
Lions form pride led by a male and several females.Lion cubs are are constantly moved to different dens to avoid predators.Cubs are often killed by other felines and male lions to induce female mating,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容
Since only female tigers can become pregnant, it is useful for scientists to watch for signs of pregnancy during a tiger's mating season. Signs of pregnancy include a swollen abdomen and visibly protruding teats. Differences in Behavior
Here, male intrasexual competition is less intense and males defend territories of up to 2 or 3 km2. In the homogeneous areas, female ranges include many small male territories; in the areas of heterogeneous grassland, some females remain within single male territories. There is continuous ...
Copulation was never observed, but on three occasions non-focal pairs were seen intertwined in a pre-copulatory position. The male positioned himself above and behind the female before quickly throwing two and a half coils around the female to hold her firmly. In each case the coils were posit...
Imoso, the highest-ranking male in the Kanyawara community of Kibale National Park, Uganda, grooms Outamba, a middle-aged female. Male chimpanzees at Kanyawara consistently prefer the oldest females in their community as mating partners, suggesting that the preference that human men exhibit for ...