Why do mammalian eggs have a small concentration of yolk, while bird and reptile eggs have a large concentration of yolk?

but there is no

i guess you forgot putting it.

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.

where is the scientific experiment?