The Top 5 Causes of Species Decline

  Cause of Species Decline
1 Loss or degradation of habitat
2 Invasive alien species
3 Harvesting (hunting/gathering)
4 Accidental mortality (poisoning, entanglement, vehicle collision, etc)
5 Persecution (pest control, etc)
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Sources:  IUCN 2004. 2004 IUCN Red List of Threatened Species.

List Notes: 
Causes of Species Decline

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