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Antechinus
Antechinus is a genus of dasyurid marsupial that is indigenous to Australia (including Tasmania and some outlying islands) and New Guinea. The majority of Antechinus species occur in Australia and only two species have been described in New Guinea. Members of this species have been called broad-footed marsupial mice, pouched mice, or antechinus shrews. However, these common names are to be considered either regional or out of date. The modern common name for animals of this genus is 'Antechinus'.
Antechinuses are small, carnivorous, shrew-like animals. They primarily prey on invertebrates such as spiders, beetles (including larva), and weevils. Some are strictly terrestrial and hunt only at ground level, while others are climbing in nature. Most species nest communally in tree-hollows.
Antechinus only live long enough to breed once in its lifetime. Breeding occurs in winter (usually August-September) at a time when there is little food available in the environment. In order to ensure breeding success, male Antechinuses strip their body of vital proteins and also suppress the immune system so as to free up additional metabolic energy. Individual male trades away long-term survival in return for short term breeding success. Following the breeding season there is a complete die-off of physiologically exhausted males. Breeding is intensely competitive. Males produce large amounts of testosterone and mate guarding occurs in the form of protected copulation (up to twelve hours in some species).
The females can store sperm for up to three days in specialized sperm-storage crypts. The sperm does not ovulate until the end of the breeding season. Many litters have multiple-paternity. Females can live for 2-3 years. However, this is unusual and most females die following the weaning of their first litter. Litters size depends on the number of teats in the pouch. There are as few as 4 teats, usually 8, and in some populations up to 10 can occur. It is currently unknown why teat number varies. It is likely that in food-poor environments selection has tended towards fewer teats so that there is a greater parental investment per offspring.

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