Abstract
The length of life of a wild animal is obviously of fundamental importance to the studies of ecology and management of the species. This paper describes investigations designed to determine how long Brown Rats (Rattus norvegicus) live under natural conditions. Although for rats the length of life in captivity is known, it is of little use in ecological work. These studies of survival of rats were conducted near Baltimore, Maryland at a farm on which the chief activity was breeding and boarding race horses. The farm had about 50-60 horses, 10-12 cows, 1020 pigs, about 100 chickens and ducks, and
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