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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.
For example, female white-headed leaf monkeys were observed to wean their infants significantly more quickly during male takeovers as compared to socially stable periods. [32] Females with infants too young to be weaned left with the old males and returned after their offspring had fully weaned, again after a significantly shorter weaning ...
They clearly weren’t mourning the albino baby’s death. Instead, their behavior seemed dominated by an attitude of curiosity. But this did not detract from their understanding of what had happened.
[7] [14] Humans spend a lot of their time caring for their children as they develop whereas other species stand on their own from when they are born. The faster an infant develops, the higher the reproductive output of a female can be. [17] So in humans, the cost of slow development of their infants is that humans reproduce relatively slowly.
The boa in the U.K., a 6-foot, 13-year-old Brazilian Rainbow Boa named Ronaldo, gave birth last week after having no contact with any other snakes for at least nine years, according to the City of ...
The genetics and abortion issue is an extension of the abortion debate and the disability rights movement.Since the advent of forms of prenatal diagnosis, such as amniocentesis and ultrasound, it has become possible to detect the presence of congenital disorders in the fetus before birth.
Minnesota Department of Health documents show that eight infants were born alive during abortion procedures between 2019 and 2022, and, in 2023, Walz signed legislation that repealed most of a ...
The larval stage of insect development is considered by some to be a form of altricial development, but it more accurately depicts, especially amongst eusocial animals, an independent phase of development, as the larvae of bees, ants, and many arachnids are completely physically different from their developed forms, and the pre-pupal stages of ...