Turkey vulture (Cathartes aura) and black vulture (Coragyps atratus) populations are increasing. Both species generally roost in abandoned buildings or large trees and can congregate with numbers reaching 100 birds or more. Urbanization has forced roost and nest sites that were once isolated from view into our communities and backyards and can cause concerns for human health and safety in areas where large roosting concentrations occur. Vulture roosts become a concern when the vomit and excrement produced by roosting vultures begins to conflict with human activity, as well as the property damage associated with large numbers of birds congregating on homes and businesses.

Nuisance vulture roosts are a new issue; Eccologix recommends a long term strategy consisting of harassment and non-lethal deterrent techniques to discourage vultures from habituating roosting sites. Non-lethal harassment and scare tactics are available to disperse vultures from roost sites, but these techniques produce temporary results and require continuous harassment. Use of exclusionary devices such as fencing or spikes is effective but requires a long-term commitment from the affected neighborhoods.