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Common & Eurasian pygmy shrews (genus Sorex), size comparison. The common shrew is not an endangered species, but in Great Britain it, like other shrews, is protected from certain methods of killing by the Wildlife and Countryside Act of 1981. [16] In Britain, shrews can be found at densities of up to one per 200 m 2 (240 yd²) in
Baby house shrew. The Asian house shrew is a voracious insectivore with little resistance to starvation. It is active during the night, spending the day in a burrow or hiding place in human habitations. They breed throughout the year, with each female averaging two litters per year. The gestation period is one month.
All shrews are tiny, most no larger than a mouse. The largest species is the Asian house shrew (Suncus murinus) of tropical Asia, which is about 15 cm (6 in) long and weighs around 100 g (3 + 1 ⁄ 2 oz) [2] The Etruscan shrew (Suncus etruscus), at about 3.5 cm (1 + 3 ⁄ 8 in) and 1.8 grams (28 grains), is the smallest known living terrestrial mammal.
The Etruscan shrew (Suncus etruscus), also known as the Etruscan pygmy shrew, white-toothed pygmy shrew and Savi’s pygmy shrew, is the smallest known extant mammal by mass, weighing only about 1.8 g (0.063 oz) on average.
Crawford's gray shrew is one of the smallest desert mammals and one of the world's smallest homeotherms.When fully grown, it will only grow to a size of about 1.5 to 2 in (3.8 to 5.1 cm) long, half of which is the tail, and it will only grow to a weight of about 3 to 5 g (0.11 to 0.18 oz).
The breeding period of the ornate shrew starts in late February and ends in late September or October. [17] Shrews of similar size have a gestation period around 21 days, but no definitive information on the ornate shrew is available. [17] A litter can consist of 4 to 6 baby shrews which are expected to live for about 12 months. [7]
The American pygmy shrew is the smallest mammal native to North America and is one of the smallest mammals in the world, just slightly larger than the Etruscan shrew of Eurasia. Its body is about 5 cm (2 in) long including a 2-cm-long tail, and it weighs about 2.0 to 4.5 g (0.07 to 0.16 oz). [ 9 ]
The shrew has to eat almost constantly, because they can only survive a few hours without food. [7] Their metabolism drops when they are at rest. McCay and colleagues (1997) found a higher abundance of masked shrews in non-irrigated forests due to a higher availability of larval insects, which is the preferred food source of the masked shrew.