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Only two species of tick (Ixodes hexagonus and Ixodes canisuga) were found to infest suburban foxes. The populations of these two ticks were examined, their distributions within the host population described, and infestation levels of I hexagonus discussed in relation to the sex, age and behaviour of the host. The most important factor regulating the level of tick infestation is probably the degree of den usage by the host. The tick infestations were found to have minimal effect on the host, and even an abnormally high level of infestation found on one fox was not considered to be lethal.