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Optimal level of intake

Sources of foraging information Dietary information regarding the feeding habits of hazardous wildlife is available through the scientifi c literature, direct observation of wildlife foraging on or near airports, and by collecting representative individuals and using methods of dietary analysis. Direct observation of foraging birds is 1 method of identifying the specifi c foods and forage resources used by hazardous birds (Duff y and Jackson 1986, Rosenberg and Cooper 1990). Optics (e.g., binoculars, spott ing scopes) and the ability to quickly and accurately identify prey items are essential. This method has biases and disadvantages, as proper identifi cation of prey items and the overall proportion of observed prey items in the diet might be diffi cult to obtain (Duff y and Jackson 1986, Rosenberg and Cooper 1990). Many forms of dietary analysis have been utilized to quantify the feeding habits of various wildlife species, including the analysis of stomach contents (Duff y and Jackson 1986, Rosenberg and Cooper 1990). Birds that collide with aircraft , birds killed during wildlife control operations to increase air safety, and potentially hazardous birds collected specifi cally for dietary analyses are sources of appropriate samples. Irrespective of the source of specimens, it is very important that the specimens collected are representative of the situation in question