Starting your walk in the select environment you should have all the senses to the alert and above all proceed with caution and in silence because that is the only way you will have the possibility to meet some animal. Observe every angle and pay particular attention to any noise and smell. If you find some leaves, pieces of bark or feathers of bird, rests of animal faeces or alimentary rests, you can pick them up, but do not ever tear branches from the trees and above all do not remove stones or ground if you are visiting a protected territory (Park or Reserve). All the picked materials deserving of deepening, must be systematized in transparent plastic pouches: using a pen you can write onto the outside date and place of recovery and possible identification. The materials that cannot be removed can be photographed. For every photo you will effect you can mark in the block-notebook the progressive number of the rolls and the particular reference that you will hold important.