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The genus ''Onychomys'' contains species commonly referred to as grasshopper mice. ==Biology== The three species in this genus of New World mice are only distantly related to the common house mouse, ''Mus musculus''. They are endemic to the United States and Mexico. The southern grasshopper mouse has around a 3.5 to 5.0 inch long body and a tail that is generally 1.0 to 2.5 inches long. 〔"Mearns' Grasshopper Mouse (Onychomys Arenicola)." Mearns' Grasshopper Mouse (Onychomys Arenicola). The Mammals of Texas- Online Edition, n.d. Web. 10 Apr. 2013.〕 Its behavior is rather distinct from other mice. It is a carnivorous rodent, dining on insects (such as grasshoppers), worms, scorpions, snakes, and even other mice. It also stalks its prey in the manner of a cat, sneaking up quietly, and defends its territory by "howling" like a small wolf. The grasshopper mouse is known to be immune to various venoms released by its prey (scorpions, snakes, etc.).〔(Onychomys: Tiny Terror of the Western Deserts )〕 Grasshopper mice tend to have low population densities. They are either alone or in pairs, one male with one female. Very territorial, their average territory size may equal their home range size of about 28 acres. Their aggressive nature extends beyond their hunting habits, and when held in captivity with other mice, they will often kill and eat those other mice. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「grasshopper mouse」の詳細全文を読む スポンサード リンク
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