Two kinds of birds eat the same food and nest in the same area. these two species of birds are in
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The answer is competition.

Competition is a type of interaction between two organism in which both the organisms try to get the same resource such as food, water, territory etc.

Competition can be of two types:

Inter-specific in which organisms of different species compete for the same resource,

Intra-specific in which organisms of the same species are in the competition.

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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.