plural of painted tree rat

The aquatic larva of a hoverfly in either the tribe Eristalini or the tribe Sericomyini, which breathes through a tail-like air tube.

plural of rat-tailed maggot

A kind of rat with no thymus and thus a severely compromised immune system, used in medical research.

plural of Rowett nude rat

An outbred rat used in medical research, white with a black or brown hood.

plural of Long-Evans rat

Oryzomys couesi, a semiaquatic rodent in the family Cricetidae occurring from southernmost Texas through Mexico and Central America into northwestern Colombia.

plural of Coues' rice rat

(simile, informal) Soaked to the point of being highly unattractive; bedraggled.