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PubMed1995

[Infanticide committed by the mother].

Using data gathered at the Institut Philippe Pinel in Montréal, we shall describe the sociodemographic and psychiatric profile of a sample of 17 women who have killed (n = 14) or attempted to kill (n = 3) one of their children. Our data indicate that women who have committed this type of offence generally come from a disadvantaged socioeconomic environment. Most have a psychiatric history (evaluation and/or hospitalization). Review of the offence demonstrates that most women do not use a weapon to kill their child; the preferred methods are strangulation or drowning. Most of these offences may be classified as extended suicide or altruistic acts. Several of the women present with a severe personality disorder and an additional depressive episode in the context of the offence. We hope our study will help clarify understanding of filicide and assist in the development of certain prevention axes. These results indicate that the population at large and various intervenors in our society (family physicians, psychiatrists, criminologists, social workers, pediatricians, psychologists, gynecologists) must become increasingly vigilant and avoid trivialization of signals such as verbalization of homicidal thoughts about the child or recourse to certain disorganized behaviours.

Adult↗
PubMed1997

[The Gretchen question: acquittal after infanticide in denied pregnancy?].

A mentally healthy woman killed her newborn directly after parturition. The physical and mental factors of pregnancy were continuously concealed, and even the menses persisted for nine months. Psychiatric expert opinion certified a psychologically exceptional state of mind of the woman, and the court acquitted her.

Adult↗
PubMed2005

Attacks on a wild infant ring-tailed lemur (Lemur catta) by immigrant males at Berenty, Madagascar: interpreting infanticide by males.

An orphaned infant ring-tailed lemur (Lemur catta) was attacked persistently by immigrant males and disappeared with severe wounds at Berenty Reserve, Madagascar. Prior to the attacks, two troop members disappeared. On 20 November 1998, the only resident male in Troop C2B disappeared suddenly. After the disappearance, nine males from three neighboring troops approached, but only six males continued to shadow the troop. Of the females, the one lactating female attacked the males the most frequently. On 21 January 1999, the lactating female disappeared and her infant was orphaned. Subsequently, five attacks on the infant by immigrant males were observed for five consecutive days from January 23 to 27. The aggression was persistent and specifically targeted the infant, suggesting that the attacks were purposeful aggression, rather than redirected or accidental aggression. The primary attacker was the most dominant of the immigrant males, and mated with females in the next mating season.

Aggression↗
PubMed2006

Rescue behavior in white-faced capuchin monkeys during an intergroup attack: support for the infanticide avoidance hypothesis.

In this work we report the first published observational evidence of rescue behavior during an intergroup interaction in white-faced capuchin monkeys (Cebus capucinus). The study groups (groups AA and RR) inhabit the forest of Lomas Barbudal Biological Reserve in Guanacaste, Costa Rica, and have been under investigation since 1990 and 1997, respectively. Here we report a single interaction in which a victim mother-infant pair was rescued from potential injury or death by the intervention of an adult male from their social group during an intergroup encounter. We discuss several hypotheses that may be relevant in explaining this unique observation.

Aggression↗
PubMed1989

Effects of maternal diet, body weight and body composition on infanticide in Syrian hamsters.

We examined the idea that female hamsters kill and eat their own offspring as part of an organized mechanism that balances litter size with metabolic energy supply. In Experiment 1, females fed diets that made them lighter and leaner cannibalized more offspring and maintained smaller litters than females fed diets that made them heavier and fatter. A greater supply of metabolic energy from the diet and/or from body fat stores may have attenuated cannibalism in heavier mothers. In Experiment 2, food restriction during lactation increased the level of cannibalism to a greater degree in lighter, leaner mothers. Heavier, fatter mothers may have eaten fewer offspring because they were better able to mobilize fatty acids from adipose tissue as an alternative fuel source during food restriction. These results suggest that an important factor influencing cannibalism of pups is the general availability of metabolic fuels from both external (food supply) and internal (adipose tissue) sources.

Animals↗