Hawaiian Monk Seal — Kenyon and Rice 
should be successful for temporary markings 
(as it was found to be on the Alaska fur seal). 
In Midway Atoll, we tagged 16 seals, in- 
cluding all of the pups (4), all of the year- 
lings (6), 3 subadults, and 3 adults. These 
represented about 23 per cent of the total 
Midway population. At Kure Atoll, we tagged 
1 yearling and 15 pups, or 65 per cent of the 
pups born during the 1957 season. At Laysan 
Island, David Woodside tagged 25 seals, the 
majority being pups, possibly a few yearlings, 
1 adult female and 1 subadult female. For the 
convenience of future workers, the series are 
listed: Midway, MS-1 to MS-16; Kure, MS-17 
to MS-32; Laysan, MS-51 to MS-75. 
Home Range 
size: With the exception of mothers with 
nursing pups, it is apparent that each seal 
ranges widely in Midway Atoll. Of the 16 
seals tagged at Midway, 10 were subsequently 
seen a total of 22 times, exclusive of repeat 
227 
observations on nursing pups (Table 7). The 
observations of tagged animals reveal that in- 
dividual seals do not habitually haul out at 
the same place. Rather, there are a number of 
favored hauling grounds which most of the 
seals use at one time or another. These 
regularly-used hauling grounds are several 
small permanent islets (Seal Island, Rocky 
Island, and Dynamite Island) plus one to 
three shifting sandspits which lie between 
Sand Island and Eastern Island. The south 
and east shores of Eastern Island are also 
frequented by seals. On Sand Island, with its 
many human inhabitants, seals occasionally 
haul out on Picket Point and Erigate Point. 
Particularly during the summer, a number of 
seals were seen hauled out on the flat rocks 
of "Eive-mile Reef.” The entire seal popula- 
tion in Midway Atoll seems to share a com- 
mon home range which includes most of the 
lagoon, or at least its southern and eastern 
halves. 
TABLE 7 
Movements of Tagged Hawaiian Monk Seals in Midway Atoll, 1957 
(Repeats of unweaned pups excluded) 
TAG NO. 
AGE 
SEX 
TAGGED 
OBSERVED 
DISTANCE MOVED 
SINCE PREVIOUS 
OBSERVATION 
Date 
Locality 
Date 
Locality 
MS-1 
yrl 
9 
March 5 
Seal I. 
March 14 
Seal I. 
50 yards 
March 18 
Sand I. 
0.5 mile 
MS-2 
ad 
0^ 
March 5 
Seal I. 
April 5 
Eastern 1. 
1.25 miles 
MS-4 
yrl 
9 
March 5 
Dynamite I. 
March 27 
Seal 1. 
0.6 mile 
MS-5 
yrl 
9 
March 5 
Dynamite 1. 
March 14 
Rocky I. 
300 yards 
MS-7 
ad 
9 
March 5 
Rocky I. 
May 2 
Rocky 1. 
10 yards 
June 4 
Eastern I. 
1.3 miles 
MS-8 
yrl 
c7 
March 22 
Eastern I. 
March 24 
Eastern 1. 
50 yards 
MS-9 
pup 
March 27 
Dynamite 1. 
May 27 
Eastern 1. 
1.0 mile 
May 31 
Eastern 1. 
100 yards 
June 4 
Eastern 1. 
100 yards 
October 11 
Dynamite I. 
1.0 mile 
MS-10 
pup 
March 27 
Dynamite 1. 
May 13 
Eastern 1. 
0.5 mile 
May 27 
Eastern I. 
0.25 mile 
May 31 
Eastern 1. 
100 yards 
June 3 
Eastern 1. 
100 yards 
August 26 
Eastern 1. 
1.0 mile 
MS-12 
pup 
cf 
April 2 
Eastern 1. 
May 13 
Eastern I. 
1.0 mile 
May 18 
Eastern 1. 
1.0 mile 
May 29 
Eastern I. 
100 yards 
MS-14 
ad 
c7 
May 2 
East Sandspit 
May 4 
Eastern 1. 
0.5 mile 
May 8 
Eastern I. 
0.25 mile 
