An example of indirect sampling - The African elephant:
Can be sampled indirectly by counting its dung. The contents of the dung can also provide info about the animals diet.
Uses the evidence of an animals activity, such as bark scrapings, faecal pellets or leaf chewing, for an indirect
Estimate of the abundance of the animal that made or caused them.
The number of elephants can be estimated by the formula:
N = D/(R x A)
D - number of estimated droppings (can’t count actual number in area the size of a national park)
R - dung rate per elephant per day
A - number of days dung has accumulated