Sentences with phrase «male copulated»
If SST receptivity does change in response to sperm occupancy, as hypothesized above, it is possible that when short - sperm males copulate first, their sperm reach and enter SSTs located at the most proximate regions of the UVJ (vagina and middle), rendering these inaccessible to sperm from long - sperm males that copulate afterwards.
http://rspb.royalsocietypublishing.org/ Not exact matches
«With another female in the mix, the male may copulate less with the first one, or he could be depleting his sperm,» says Stoinski.
When males and females were first introduced, they usually copulated within the first 30 minutes.
Ellis and Johnson found that male bombyliid flies tried to copulate avidly with flowers whose petals most resemble female flies, seen in the top row above.
The male will go on to occasionally attempt to grip the female more firmly and to copulate.
The bats copulate dorso - ventrally, with the male mounting the female from behind.
During mating, the females reached over to lick the base of the male's penis in 14 of the 20 pairs that copulated.
The female keeps a harem of up to four males, copulating, on average, 65 times per breeding season — far more than is necessary for fertilization — before laying a clutch of four eggs.
«Why do female prairie dogs copulate with more than one male?
Typically, copulating males are disturbed by one to four rivals.
Only one in four males without the cells successfully copulated, while two - thirds of intact males finished the task.
When other mice enter their enclosure, these females squeak like male mice, sniff around the intruders» backsides, and attempt to copulate.
Males and females frequently copulate face - to - face, which is an uncommon position in animals other than humans.
Bonnefoy observed one healthy adult male macaque attempt to copulate with at least two different female Sika deer by performing sexual mounts on the animals» backsides.
Sometimes females would rather GG - rub with each other than copulate with a male.
Some of the «illegitimate» chicks were the result of males forcing females to copulate with them.
He tried pulling apart a copulating pair, and wound up ripping the male in two: the female stayed attached.
Sometimes a solitary male encountering a copulating pair will remain in physical contact with them until the first male has had enough.
Once the male has disposed of rival sperm and deposited his own, he stays copulating with her for up to two hours.
Cut males vigorously attempted to mate, but — unlike the uncut males — most slid off the females, unable to copulate.
The males are often much larger than females and if a large male attempts to copulate with a small female, he can snap the head clean off her body, says Telford.
When females behave promiscuously, copulating with more than one male in a single reproductive cycle, to what extent do they and their various partners contrive and compete to influence the outcome?
While some researchers have speculated that the animals died while copulating, the new analysis is the first to provide strong evidence — revealing, for instance, that each pair includes a male and a female.
Yet males that hook up with the wrong queens don't realize that they've made a bad choice until they begin to copulate, say the scientists who studied these pairings in a series of closely controlled experiments.
«Necrophilia in birds and non-human mammals is not a functional strategy but a mistake,» says Kees Moeliker from the Natural History Museum Rotterdam in the Netherlands, who described a case of homosexual duck necrophilia, in which a drake mallard copulated with a dead male for 75 minutes.
A male normally knows a female is ready to copulate when she eventually starts moving.
Rather, the male marmoset's behavior, including the attempts to copulate with the female, could indicate that he was excited and aroused by her lying on the ground, «rather than any kind of compassion.»
When an alpha male took over the tribe, the females would simulate estrus, the period of ovulation, to copulate with him and convince him that he was the father of their offspring, thereby gaining his protection.
However, our understanding of reproductive behaviour in internal fertilizers has been revolutionized by the realization that females often copulate with more than one male, providing the scope for sexual selection to continue after copulation [2].
Since humans are single sexed animals it is necessary for male and female of the species to come together and copulate to in order to facilitate reproduction.
Similarly, Yoan Capote combines humor with political commentary in his collage Coito (2004), presenting two male figures copulating, each cut from Cuban and U.S. currency.