When individuals do not regulate their hunting in order to reduce the possible collective effects of endangering a particular species, can result.

When individuals do not regulate their hunting in order to reduce the possible collective effects of endangering a particular species, a social trap can occur.

Explanation:

in the world of psychology, a social trap can be described as a situation in which certain actions are taken for a short-term benefit. These short-term benefits may be harmful in the long run in one way or the other.When we use up a food resource or mineral resource in an exponential manner, it becomes depleted from nature. In this way, we deplete our future generations from that resource. This is a social trap.

Like, in the scenario discussed in the question, hunters hunt a species without any regulation due to which the species might get endangered or extinct. This will make the ecosystem unstable and in the long run will be a harmful or alarming situation. Hence, social trap is the correct option.

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.