1) Genus oryzomys 2) Mammal genus 3) Rice rats 
Oryzomys is a genus of semiaquatic rodents in the tribe Oryzomyini living in southern North America and far northern South America. It includes eight species, two of which—the marsh rice rat (O. palustris) of the United States and O. couesi of Mexico and Central America—are widespread; the six others have more restricted distributions. The spe...
[n] - rice rats
genus Oryzomys noun rice rats