opportunivore

noun3

1. •
   A person who subsists on still-edible food that has been or was going to be discarded.
2. •
   One who will generally eat whatever is available, having a diet that excludes few foods.

   • Their secret? Like us, they [coyotes] survive by adapting: they’re opportunivores, feeding on everything from insects to garbage to deer; […] — 2010
3. •
   A person who actively seeks or takes advantage of opportunities.