et. Of the males 23.7 per cent were at the
same place at the first and last captures; for females the percentage
was 36.1. These figures are from the combined data of our trapping
records, but the trends differed sharply in the two sets of records. In
Fitch's records, movements averaged longer and difference between the
sexes was much less: 189 feet for 41 males and 178 feet for 42 females.
Corresponding figures from Rainey's records were: 141 feet for 31 males
and 74 feet for 30 females. In Fitch's field work, opportunities to
record exceptionally long movements obviously were better because the
trap line encompassed a larger area, approximately half a square mile,
whereas Rainey's live-trapping was concentrated on relatively small
areas. The reason for the greater vagility of females in Fitch's records
is less evident. However, the data were obtained within the period of
drastic population reduction, at a time when there were numerous empty
houses throughout the woodland, facilitating travel, and shifts from one
home range to another where conditions were, temporarily at least, more
favorable. Rainey found that the females in the small colony in woodland
where he trapped, moved much less than did those that lived along the
hilltop outcrop, which provided a natural travel route.

Following are several examples of males and females with long histories
showing individual variation in frequency and distance of movements.

_Males_

(1.) First captured October 14, 1951, and last captured 327
days later on September 6, 1952. He was taken 12 times. For
the first seven captures (October 14, 1951, to July 15,
1952), no movements were recorded. In the following seven
days he moved 367 feet. Within the next 21 days he returned
to within 114 feet of the site of original capture. Less
than one month later he was caught for the last time, at
this same site.

(2.) This large male was captured twelve times over a period
of 827 days (March 16, 1952, to June 21, 1954). He tended to
wander more than other males and was absent from the
trapping area from early 1952 to May 1953. One round trip
made in a two-weeks period, amounted to a linear distance of
1894 feet if the rat followed natural cover. The return trip
of 947 feet was the greatest distance traversed in a single
night in any of the woodrats we recorded. Other movements
between successiv