- American harvest mouse, harvest mouse - any of several small grayish New World mice inhabiting e.g. grain fields
--1 is a kind of New World mouse
--1 is a member of Reithrodontomys, genus Reithrodontomys - harvest mouse, Micromyx minutus - small reddish-brown Eurasian mouse inhabiting e.g. cornfields
--2 is a kind of mouse
--2 is a member of Micromyx, genus Micromyx