Poaching refers to the illegal taking of wildlife, in violations of laws that regulate wildlife hunting. Examples of poaching includes; killing an animal out of season, hunting without appropriate licensing, using prohibited weapons to hunt animals, etc.
Over utilization of a specie refers to the near-extinction or extinction of a particular species as a result of incessant killing. Poaching can lead to a situation where a particular animal specie will be completely wipe out as a result of excessive, inconsiderate killing. The extinction of a particular animal specie may have negative effects on the local environment.