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Mice used to study CR seem to be on the threatened species list.

Random Samples
Science 29 September 2006: 1863.
DIETING MICE OUT OF STYLE?

To the dismay of some longevity researchers, the
National Institute on
Aging (NIA) wants to stop supplying them with hungry old
rodents. Citing
waning demand and costs amounting to $800,000 a year, NIA
announced this
month that by 2013 it may close its long-running colony of
mice and rats
raised on a calorie-restricted diet.

Rodent studies have shown that restricting calories
can extend life
span. "It's a real blow to development of knowledge in this
area," says
Roger McCarter of Pennsylvania State University in State
College, a former
president of the American Aging Association. On the other
hand, Roger
McDonald of the University of California, Davis, says he and
others now
raise their own low-cal colonies in order to have more
control over
conditions.

Orders for NIA's calorie-restricted rats dropped by
half between 2001
and 2005, to 481, says Nancy Nadon, who oversees the colony.
Ironically, due
to "soar[ing]" demand, NIA says it is running short of elderly
non-calorie-restricted rodents, of which it disburses about
30,000 a year.