“…However, various measurements of housing are a common variable with which bird community composition, species richness and density are often related. Therefore we agree with other authors in suggesting that housing may be a surrogate variable for several factors associated with urbanization such as plant and food supplementation, or pets and human disturbance levels (Freisen et al, 1995;Jokimaki and Huhta, 1996;Yeoman and Mac Nally, 2005). Experimental manipulation of suburban matrix characteristics is needed to help determine the identity of these factors and their effect, especially as some potentially influence both daily movements and dispersal movements of sub-populations.…”