To make the checklist of living things look tidy, many scientists lump everything that does not fit neatly into the other four kingdoms under this fifth kingdom. Consequently, it is not as organised as the other four and is like a 'too-hard basket' of biological classification. What appears to be one species may actually be several. Close inspection of this longicorn beetle reveals parasitic mites on its surface. In order to deal with the enormous diversity of life on Earth, it is not enough to understand it just on the level of kingdoms.
Scientists have to examine diversity at many other levels between kingdom and species.
For example, no botanist can study all of the organisms within the plant kingdom. But this basic framework only shows how biodiversity is classified into groups. It does not clarify the complex characteristics that make up each species, or each individual. Nor does it explain the diverse interactions between groups of co-existing species. Some plant biodiversity is dependent upon the Cassowary which is an important seed disperser in tropical forests.