The best possible way to study how tigers interact with each other in their habitats would be to use a naturalistic observation. This type of observation focuses on observing the main subject of the study in it's natural environment without interfering in any sort of way. This allows the scientists to observe exactly how the tigers interact when there are no humans around.
This is the method which involved the observation of organisms in their natural environment. It is a research method employed by social scientists when it is difficult to carry out laboratory studies, or the latter studies is capital intensive, or the laboratory studies will affect the behaviours of the organisms under study, leading to inaccurate results.
It gives perfect results because the understudy organism are in their natural habitats,with little or no intervention in natural social life . This may not be possible in laboratory settings.Thus they exhibit natural behaviour / characteristics, desired by the investigator. Generally organism exhibit their true characteristics when placed in natural environments.
Its main disadvantage is that it is difficult for the researcher to control the factors or variables in the external environments and even to determine the exact factor which leads to the observed behaviour..
The answer to this is older, but it's not a proven fact even though schools teach it as if it were. It is still just a theory if you think about it with how much the earth moves, areas of rock could be complete upside down and no one would know, it would be like history in reverse.
