1) Animals that use echolocation 2) Genus of shrews 3) Genus sorex 4) Mammal genus 
The genus Sorex includes many of the common shrews of Eurasia and North America. Members of this genus, known as long-tailed shrews, are the only members of the tribe Soricini of the subfamily Soricinae (red-toothed shrews). They have 32 teeth. These animals have long pointed snouts, small ears which are often not visible and scent glands located ...
• (n.) A genus of small Insectivora, including the common shrews.
(from the article `marsupial mouse`) ...are erected. Tuans are arboreal but may raid poultry yards. In both appearance and behaviour the flat-skulled marsupial mice, or planigales ... ...12 to 15 cm long and a tail 8 to 10 cm long. The short, dense, and soft fur of shrews ranges from gray to black with either slightly paler tones ... ...
So'rex noun [ Latin , a shrew.] (Zoology) A genus of small Insectivora, including the common shrews. 
[n] - type genus of the family Soricidae: shrews
Sorex The genus of shrews
genus Sorex noun type genus of the family Soricidae: shrews