Summary: July1987] ShortCommunications 517
Interisland Variation in BloodDrinking by GalhpagosMockingbirds
ROBERTL. CURRYAND DAVID J. ANDERSON·
Few speciesof birds are known to feed on the blood
of living animals,and the occurrenceof thisbehavior
in populations of the Sharp-beaked Ground-Finch
(Geospizadifficilis)on Wolf and Darwin islands, Ga-
1965,KiSsterand KiSster1983,Schluter and Grant 1984).
It is lesswidely recognized,however,that Galhpagos
mockingbirds(Nesomimusspp.) on someislandsalso
drink blood from living hosts. Occasionalblood
drinking by mockingbirdson two islandswas men-
tioned previously, but without details on the fre-
quency or distribution of the trait (Bowman and Car-
ter 1971, Christian 1980).
We observed blood drinking during studies of
breedingbiology (Anderson)between 1981and 1985.