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Some females abort or resorb their own young while they are still in development after a new male takes over; this is known as the Bruce effect. [31] This may prevent their young from being killed after birth, saving the mother wasted time and energy. However, this strategy also benefits the new male.
In many instances of nonparental infanticide in carnivores, the male of a species kills the young of a female to make her sexually receptive, e.g. brown bears. When one or two new male lions defeat and exile the previous males of a pride, the conqueror(s) will often kill any existing young cubs fathered by the losers. [3]
The Bruce effect, or pregnancy block, [1] [2] is the tendency for female rodents to terminate their pregnancies following exposure to the scent of an unfamiliar male. [3] The effect was first noted in 1959 by Hilda M. Bruce, [4] and has primarily been studied in laboratory mice (Mus musculus). [1]
In the US, only 25% of men between the ages of 18 and 29 identify as politically liberal, while 40% of women in the same age group do, according to a recent Gallup poll.
Men must play their part How these potential attacks on female contraceptives play out over time is unclear. What is clear is that 46% of all pregnancies in the U.S. are unintended .
A white-fronted capuchin sits in a tree. Cases of infanticide in white fronted capuchins have been attributed to resource competition. Infanticide in non-human primates occurs as a result of exploitation when the individuals performing the infanticide directly benefit from consumption or use of their victim. [1]
States now have the power to determine their own abortion laws instead. The incoming president has stated repeatedly that he would veto a federal abortion ban. The number of abortions in America ...
To counteract loss of their pups elephant seals conceive next year's offspring immediately after giving birth to this year's young, but delay implantation for 4 months. Female striped mice ( Rhabdomys pumilio ) in monogamous social groups do not experience reproductive suppression, but those living in communally breeding groups with high ...