<em>Saprobes</em><em> </em>derive their nourishment from nonliving or decaying organic matter.
<em>Detritivores</em> feed on dead, organic material and play an important role in the breakdown of organic matter from decomposing animals and plants.
The most likely cause of the beak variation is the food source of the finch, the break size and shape was adapted to most likely have easier and better access to food. <span />
