Biodiversity is the variety of different types of life found on Earth and the variations within species. It is a measure of the variety of organisms present in different ecosystems. This can refer to genetic variation, ecosystem variation, or species variation (number of species) within an area, biome, or planet.
Craftsman is one of the leading brands of gas and electric chain saws. Craftsman chain saws come in a variety of bar lengths, from 10 inches to 20 inches, and are geared to the consumer market. The Craftsman electric chain saws have smaller bar lengths than their gas counterparts.
While Hitachi aren't well known for making chainsaws, and it probably is built in a Chinese factory, they have a pretty good name in the power tool field. Most of their stuff is professional grade, not cheap junk. They can probably engineer a 1/2 decent chainsaw. http://www.hitachipowertools.co.nz/outdoor-power-equipment/chainsaws.cfm Ian