@azadeh,
how will you develope your initial data sets?
There are lots of different methods for establishing data sets. What will work most reliably for one species will not be reliable for another.
Depending on the animal(s) you seek and the area to be covered line transects may be the most usefull tool.
Repetition is the only method of proving data sets (or comparison with other previouse data sets). Even then some leeway for environmental factors must be allowed.
For birds a method that can be quite reliable is nest sites and calls.
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