packrat

n.	1.	Any of several bushy-tailed rodents of the genus Neotoma of western North America, especially Neotoma cinerea, which hoard food and other objects in their nests.
	2.	A person who habitually saves items, even those unlikely to be useful.

Thesaurus

Noun	1.	packrat - a collector of miscellaneous useless objects aggregator, collector - a person who collects things
	2.	packrat - any of several bushy-tailed rodents of the genus Neotoma of western North America; hoards food and other objects bushytail woodrat, Neotoma cinerea, trade rat, pack rat wood rat, wood-rat - any of various small short-tailed rodents of the northern hemisphere having soft fur grey above and white below with furred tails and large ears; some are hosts for Ixodes pacificus and Ixodes scapularis (Lyme disease ticks) genus Neotoma, Neotoma - packrats dusky-footed woodrat, Neotoma fuscipes - host to Lyme disease tick (Ixodes pacificus) in northern California