The most common cell body stain used in brain histology is called

Biological tissue has little inherent contrast in either the light or electron microscope. ... Hematoxylin and eosin (H&E stain) is the most commonly used light microscopical stain in histology and histopathology.

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.