זרזירים ויונקים

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Weeks (2000) Red-billed oxpeckers: vampires or tickbirds? Behavioral Ecology 11 (2):154-160
Weeks (1999) Interactions between red-billed oxpeckers, Buphagus erythrorhynchus, and domestic cattle, Bos taurus, in Zimbabwe. Animal Behaviour 58(6): 1253–1259
Dickman (1992) Commensal and mutualistic interactions among terrestrial vertebrates. Trends in Ecology and Evolution 7(6): 194-197