How might the population of toucans suddenly increase? How might this affect the ecosystem?

1.) A decrease in the population of the animals in the trophic level above it.

2.) It will decrease the population of the animals in the trophic levels below it.

Explanation:

The population would increase if the predator of toucans decreased. This would mean less toucans would die so you would see an increase in their population as they could reproduce more. It will decrease the population of the tropic levels below because an influx of toucans would be more than the other levels could handle.

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.