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Transcription
Johnston, D. W.
1964
Wake Island
birds didn't fly too readily in the dark, but I doubt that we banded any-
where near 1/100 of the birds in the colony. Happily, there were 9 banded
birds in the trench--all banded last year as adults in June or July on this
island. his would suggest that some of the terns are on nearly a 10 month
cycle. Although one might literally be surrounded by terns all over the
ground, as soon as you started picking them up to be banded, in spite of
the deafening roars, somehow or other the nearby birds on the ground would
gradually leave until, after banding 2-3 birds, there might then be none
in reach. I just wonder if they didn't utter a particular alarm note when
being caught, thus tending to frighten many of the others away. Certainly
the easiest to catch were the incubating adults, then their presumed nearby
mates. I'm simple dumbfounded by the fact that all incubating adults that
we've handled had 2 incubation patches, and yet only very rarely do the
birds here lay more than one egg. It is not unthinkable that under some
conditions--perhaps late nesting, a poor season, etc. -- they could and
do lay 2 eggs more frequently. As on a previous visit we saw feral house
cat at the edge of the colony. Found a pile of several tern wings. This
is likely the only serious predator of the terns, since there is an active
rat control program on Wake. Noted an interesting symbiotic relationship
between Brown Booby nests and hermit crabs. The crabs, large and reddish,
gathered in numbers from 1-5 at the edge of the nests and consumed all or
parts of the fish that the boobies disgorged. Evidently the boobies will
disgorge fish even when not being frightened by men because on at least 1
occasion we found a 1 ft. fish [illegible] consumed by the crabs.
14 Apr Flipper Point, Peale Is., Wake Is.
#1830. Sterna fuscata. ad ?, fol. to 2 mm, oviduct somewhat enlarged.