Infanticide in carnivores

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Infanticide is the killing of a neonate after birth. In zoology, this commonly refers to the killing and in some cases consumption of newborn animals by either a parent or an unrelated adult of the species. In carnivores, it is common for an unrelated male to commit infanticide to make females sexually receptive. Parental infanticide is sometimes a result of extreme stress by human intrusion.

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Parental infanticide

The giant otter becomes extremely sensitive to human activity when rearing its young. Giant otters in captivity must be given privacy when raising their litters as cases of parental infanticide have been reported in the species, potentially caused by human visual and acoustic interference. Though not confirmed, it has been suspected that similar occurrences happen in the wild due to tourists. [1] In the wild, polar bear mothers will sometimes kill their young because they lack adequate food, but in captivity the main reason is stress. [2]

Nonparental infanticide

Lion cubs are frequent victims of nonparental infanticide by usurping males. Mother lion and cubs.jpg
Lion cubs are frequent victims of nonparental infanticide by usurping males.

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] As many as 80% of lion cubs die before they reach the age of two. [4] Often a lioness tries to defend her cubs against this kind of behavior from the usurping male(s), but success is more common when a group of females join to defend their offspring. [3] Within five months of a tigress giving birth, she may become receptive again if her first litter is lost, and for this reason wandering males may commit infanticide. [5] In fear of infanticide, female jaguars will not tolerate the presence of any male, even the father of the litter, once she gives birth to her cubs. [6]

If the father of a leopard's litter is present for the rearing of the cubs, there are fewer instances of infanticide as foreign males stay farther away from the cubs.

Groups of banded mongooses have been observed kidnapping and/or killing the members of other groups for no confirmed reason, though many theories have been suggested. [7]

Species known to commit infanticide

Exceptions

Due to the reproductive behavior of female cheetahs, males are unlikely to commit infanticide. Cheetah cub close-up edit2.jpg
Due to the reproductive behavior of female cheetahs, males are unlikely to commit infanticide.

Unlike other African felids, no infanticidal behavior has been observed in the cheetah. [10] Scientists hypothesize that this is because many cheetah litters have cubs from different fathers and males would not want to kill any cubs in case they killed their own. [10] The promiscuity of female cheetahs helps to protect the threatened species not only by preventing infanticide but also by bringing greater genetic diversity. [12] This genetic diversity averts inbreeding from occurring and widens the genetic pool of the species. [12] Nevertheless, cheetah cubs have a remarkably high mortality rate.

Related Research Articles

<span class="mw-page-title-main">Lion</span> Large cat native to Africa and Asia

The lion is a large cat of the genus Panthera, native to Africa and India. It has a muscular, broad-chested body; a short, rounded head; round ears; and a hairy tuft at the end of its tail. It is sexually dimorphic; adult male lions are larger than females and have a prominent mane. It is a social species, forming groups called prides. A lion's pride consists of a few adult males, related females, and cubs. Groups of female lions usually hunt together, preying mostly on large ungulates. The lion is an apex and keystone predator; although some lions scavenge when opportunities occur and have been known to hunt humans, lions typically do not actively seek out and prey on humans.

<span class="mw-page-title-main">Leopard</span> Large cat native to Africa and Asia

The leopard is one of the five extant species in the genus Panthera. It has a pale yellowish to dark golden fur with dark spots grouped in rosettes. Its body is slender and muscular reaching a length of 92–183 cm (36–72 in) with a 66–102 cm (26–40 in) long tail and a shoulder height of 60–70 cm (24–28 in). Males typically weigh 30.9–72 kg (68–159 lb), and females 20.5–43 kg (45–95 lb).

<span class="mw-page-title-main">Cheetah</span> Large feline of the genus Acinonyx

The cheetah is a large cat with a tawny to creamy white or pale buff fur that is marked with evenly spaced, solid black spots. Its head is small and rounded, with a short snout and black tear-like facial streaks. It reaches 67–94 cm (26–37 in) at the shoulder, and the head-and-body length is between 1.1 and 1.5 m. Adults weigh between 21 and 72 kg. It is the fastest land animal, capable of running at 93 to 104 km/h ; it has evolved specialized adaptations for speed, including a light build, long thin legs and a long tail.

<span class="mw-page-title-main">Cougar</span> Large species of cat native to the Americas

The cougar, also known as the puma, mountain lion, catamount, or panther, is a large cat native to the Americas, second in size only to the stockier jaguar. They are not technically grouped with the "true" big cats, as they are slightly smaller than other big cats, and they lack the vocal physiology to roar. Its range spans the Canadian Provinces of the Yukon, British Columbia, and Alberta, the Rocky Mountains, and other areas in the Western United States. Their range extends further south through Mexico, where they are found in nearly every state, to the Amazon Rainforest and the southern Andes Mountains in Patagonia. The puma inhabits every mainland country in Central and South America, making it the most widely distributed large, wild, terrestrial mammal in the Western Hemisphere, and one of the most widespread on planet Earth. It is an adaptable, generalist species, occurring in most American habitat types. It prefers habitats with dense underbrush and rocky areas for stalking but also lives in open areas.

<span class="mw-page-title-main">Common warthog</span> Wild member of the pig family

The common warthog is a wild member of the pig family (Suidae) found in grassland, savanna, and woodland in sub-Saharan Africa. In the past, it was commonly treated as a subspecies of P. aethiopicus, but today that scientific name is restricted to the desert warthog of northern Kenya, Somalia, and eastern Ethiopia.

<span class="mw-page-title-main">Honey badger</span> Species of mammal

The honey badger, also known as the ratel, is a mammal widely distributed in Africa, Southwest Asia, and the Indian subcontinent. Because of its wide range and occurrence in a variety of habitats, it is listed as Least Concern on the IUCN Red List.

<i>Ursus</i> (mammal) Genus of bears

Ursus is a genus in the family Ursidae (bears) that includes the widely distributed brown bear, the polar bear, the American black bear, and the Asian black bear. The name is derived from the Latin ursus, meaning bear.

<span class="mw-page-title-main">Striped hyena</span> Species of hyena

The striped hyena is a species of hyena native to North and East Africa, the Middle East, the Caucasus, Central Asia, and the Indian subcontinent. It is the only extant species in the genus Hyaena. It is listed by the IUCN as near-threatened, as the global population is estimated to be under 10,000 mature individuals which continues to experience deliberate and incidental persecution along with a decrease in its prey base such that it may come close to meeting a continuing decline of 10% over the next three generations.

<span class="mw-page-title-main">Brown hyena</span> Species of carnivore

The brown hyena, also called strandwolf, is a species of hyena found in Namibia, Botswana, western and southern Zimbabwe, southern Mozambique and South Africa. It is the only extant species in the genus Parahyaena. It is currently the rarest species of hyena. The largest remaining brown hyena population is located in the southern Kalahari Desert and coastal areas in Southwest Africa. The global population of brown hyena is estimated by IUCN at a number between 4,000 and 10,000 and its conservation status is marked as near threatened in the IUCN Red List.

<span class="mw-page-title-main">Spotted hyena</span> Species of hyena

The spotted hyena, also known as the laughing hyena, is a hyena species, currently classed as the sole extant member of the genus Crocuta, native to sub-Saharan Africa. It is listed as being of least concern by the IUCN due to its widespread range and large numbers estimated between 27,000 and 47,000 individuals. The species is, however, experiencing declines outside of protected areas due to habitat loss and poaching. Populations of Crocuta, usually considered a subspecies of Crocuta crocuta, known as cave hyenas, roamed across Eurasia for at least one million years until the end of the Late Pleistocene. The spotted hyena is the largest extant member of the Hyaenidae, and is further physically distinguished from other species by its vaguely bear-like build, rounded ears, less prominent mane, spotted pelt, more dual-purposed dentition, fewer nipples, and the presence of a pseudo-penis in the female. It is the only placental mammalian species where females lack an external vaginal opening, having a pseudo-penis instead.

<span class="mw-page-title-main">Cape fox</span> Species of carnivore

The Cape fox, also called the asse, cama fox or the silver-backed fox, is a small species of fox, native to southern Africa. It is also called a South African version of a fennec fox due to its similarly big ears. It is the only "true fox" occurring in sub-Saharan Africa, and it retains primitive characteristics of Vulpes because it diverged early in the evolutionary history of the group.

<span class="mw-page-title-main">Fossa (animal)</span> Cat-like, carnivorous mammal endemic to Madagascar

The fossa is a slender, long-tailed, cat-like mammal that is endemic to Madagascar. It is a member of the carnivoran family Eupleridae.

The anal glands or anal sacs are small glands near the anus in many mammals. They are situated in between the external anal sphincter muscle and internal anal sphincter muscle. Their function in humans is unclear.

<span class="mw-page-title-main">North American cougar</span> Subspecies of carnivore

The North American cougar is a cougar subspecies in North America. It is the biggest cat in North America. It was once common in eastern North America and is still prevalent in the western half of the continent. This subspecies includes populations in western Canada, the western United States, Florida, Mexico and Central America, and possibly South America northwest of the Andes Mountains. It thus includes the extirpated eastern cougar and extant Florida panther populations.

<span class="mw-page-title-main">Reproductive suppression</span>

Reproductive suppression is the prevention or inhibition of reproduction in otherwise healthy adult individuals. It occurs in birds, mammals, and social insects. It is sometimes accompanied by cooperative breeding. It is maintained by behavioral mechanisms such as aggression, and physiological mechanisms such as pheromone signalling. In evolutionary terms, it may be explained by the theory of inclusive fitness.

<span class="mw-page-title-main">Infanticide (zoology)</span> Killing of young offspring by an adult animal of the same species

In animals, infanticide involves the intentional killing of young offspring by a mature animal of the same species. Animal infanticide is studied in zoology, specifically in the field of ethology. Ovicide is the analogous destruction of eggs. The practice has been observed in many species throughout the animal kingdom, especially primates but including microscopic rotifers, insects, fish, amphibians, birds and mammals. Infanticide can be practiced by both males and females.

<span class="mw-page-title-main">African wild dog</span> Endangered species of canine native to Africa

The African wild dog, also known as the painted dog or Cape hunting dog, is a wild canine native to sub-Saharan Africa. It is the largest wild canine in Africa, and the only extant member of the genus Lycaon, which is distinguished from Canis by dentition highly specialised for a hypercarnivorous diet and by a lack of dewclaws.

Erindi Private Game Reserve is a wildlife and ecological reserve in central Namibia, situated southeast of Omaruru on the regional border of Erongo and Otjozondjupa. Originally a set of three adjacent cattle farms, the 65,000 hectares estate was converted into a wildlife reserve starting in the 1990s.

The Lionshare Educational Organization (LEO) Zoological Conservation Center was an off-exhibit, nonprofit wildlife reserve and breeding facility in Greenwich and Stamford, Connecticut.

References

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  2. 1 2 Vincent, Donovan. "When moms kill their young". The Toronto Star. Retrieved 19 July 2013.
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  9. Bellemain, Eva; Swenson, Jon E.; Taberlet, Pierre (2006). "Mating Strategies in Relation to Sexually Selected Infanticide in a Non-Social Carnivore: The Brown Bear". Ethology. 112 (3): 238–246. doi:10.1111/j.1439-0310.2006.01152.x.
  10. 1 2 3 Fildes, Jonathan (2007-05-29). "Cheating cheetahs caught by DNA". BBC News. Retrieved 2007-05-30.
  11. Clutton-Brock, T. H.; P. N. M., B.; Smith, R.; McIlrath, G. M.; Kansky, R.; Gaynor, D.; O'Riain, M. J.; Skinner, J. D. (1998). "Infanticide and expulsion of females in a cooperative mammal". Proceedings: Biological Sciences. 265 (1412): 2291–2295. doi:10.1098/rspb.1998.0573. JSTOR   51272. PMC   1689533 . PMID   9881475.
  12. 1 2 "Scandal on the Serengeti". inthenews.co.uk. 30 May 2007. Archived from the original on 27 September 2007. Retrieved 25 January 2013.