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The method could be refined by looking for maggots or other signs of prey decomposition prior to ingestion, or by labelling prey with radiotransmitters which signal death but still allow location of the transmitter. Direct observation of predation (method 6) can be difficult, especially of nocturnal predators. This can be overcome by using night vision equipment if the predators or prey will allow observation without disturbing them. Radio-tracking equipment can also assist in locating prey and predators.

Common schemes used in vertebrate pest research include authoritative, systematic, random and stratified random sampling. Authoritative sampling occurs when the experimenter, the authority, decides where and when sampling will occur. No consideration is given to statistical issues or prior information but usually it is accompanied by the statement, 'this looks like a good spot'. In systematic sampling, sample units are arranged regularly; for example, there is a constant distance between them, such as plots within a transect.

01). Hence, there was nothing special about the cube root relationship, though it had some theoretical appeal. Van Tets (1969) also reported bird strikes for three other bird species during the same study but did not apparently include them in the analysis. 01). Burger (1985) reported that the analysis of bird strike records was hampered by poor identification of bird species. However, detailed identification and comparison with independent data on abundance showed that herring (Larus argentatus) and great black-backed gulls (L.

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