Numerous complaints and queries are frequently raised with regards to the ecological impacts of Pied Crows. While this species is indigenous to the Western Cape, its numbers have increased greatly due to human activities. This includes the creation of artificial roosts at nesting sites and an increase in food availability through road kills, rubbish tips and farming. There is a lot of anecdotal information that suggests that Pied Crows are having a direct negative impact on wildlife, at least at a local level.
However, the culling of an indigenous species can only be advocated if there is scientific evidence quantifying the problem and proposing methods, which could be used if culling was deemed to be viable and necessary. Without this scientific information, any control program is likely to fail. A localised control programme would in all likelihood create a vacant territory area and crows from the surrounding areas will just move in to replace the culled individuals. As such, sound research into the situation needs to be conducted before any management interventions can be implemented.
The House Crow is an alien species, which has become established, in many urban centres around the world. Unlike the Pied Crow, the House Crow is an alien species, which has been accidentally introduced by man.
In South Africa the species has become established in Cape Town and Durban. Being highly intelligent and opportunistic, House Crows will utilise any good food source available to them. They are also reputable nest raiders and can devastate local bird populations. In east Africa, House Crows have been attributed with the huge reduction is local bird species diversity in urban centres. They are also known to carry human diseases such as Cholera.
While the population is still at levels where complete eradication is possible, it is felt that the authorities should be encouraged to eradicate this species in a humane manner. The City of Cape Town is running a very successful programme to control this species through the Invasive Species Unit (ISU). The Cape Bird Club Conservation Committee is supportive of this programme.
The Egyptian Goose is locally indigenous to the Western Cape, which means they have always occurred in the Cape Town area. Their numbers have dramatically increased in recent years due to favourable conditions created by development (such as golf courses, large lawned areas) and man-induced habitat alteration and the absence of natural predators in some urban areas.
Supplementary feeding by humans can also greatly increase the densities of these birds at a given locality. The Egyptian Goose is not an invasive alien species and there is no eradication programme in place to control their numbers. Although perceived as a nuisance by some, the culling of an indigenous species cannot be advocated in the absence of scientific evidence quantifying the problem and proposing the methods which could be used to address the problem should it be necessary and viable.
Without such scientific information, any control program is likely to fail. A localised control programme would in all likelihood create a vacant territory area and birds from the surrounding areas will move in to replace the culled individuals. As such, sound research is needed to inform any management intervention considered adequate and necessary. Any and all management interventions of this nature would have to done with the consent and necessary approvals from all relevant authorities. Should any landowner consider the presence of an Egyptian Goose on their privately owned land a nuisance, the following is recommended to discourage the birds from frequenting the area;
Feeding waterfowl and other birds such as guinea fowl is a popular activity for some people. Tossing food like bread, table scraps, corn or popcorn attracts ducks, geese and other birds to places like dams, parks and ponds.
Feeding these birds is a popular pastime and a relaxing activity bringing people closer to nature, or a fun activity for children wanting to interact with wildlife. However, feeding the city’s waterfowl and guinea fowl can lead to a number of problems and even be harmful to the birds themselves.