The bird species known to forage in shrublands after they have experienced a wildfire are very ...

The bird species known to forage in shrublands after they have experienced a wildfire are very different from the bird species that forage in shrublands that have not burned.
 
  In fact, the bird species foraging in burned shrublands are closely correlated with the age of the burn, or the number of years that have passed since the fire. Certain birds forage at one-year post fire, different birds forage at three-years post fire, and so on. These birds could be called
  a. foundation species
  b. keystone species
  c. generalist species
  d. indicator species
  e. newly evolved species