Purple martins are the largest species of swallow in North America
In the Eastern United States, they breed almost exclusively in large colonies in artificial martin houses and hollowed-out gourds hung by martin enthusiasts, who often have to remove invasive house sparrows from these artificial nest sites in order for the martins to have a place to nest. The relationship between the martins and sparrows can best be described as ________, and the relationship between the martins and the martin enthusiasts can best be described as ________.
A) predation; mutualism
B) intraspecific competition; interspecific competition
C) parasitism; symbiosis
D) interspecific competition; mutualism
D
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