Many species of both wild and domestic mammal may be marked by the removal of tissues, in such a manner that individuals may be recognised throughout the rest of their life. Some tissue removal techniques are less permanent and at the same time less damaging to the animal. When selecting the most favourable method, the research worker must choose the one which will do the job effectively yet at the same time cause the least possible distress to the animal. As with most marking methods the twin aims of the permanence of the mark and the ease with which it can be seen have also to be taken into account, and the worker has to balance these factors in making his final choice.
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