Human-caused extinction
  • Habitat destruction: 
    The dodo, for example, lost its home when humans destroyed its natural habitats. 
     
  • Hunting and overexploitation: 
    The passenger pigeon went extinct from overhunting, while the dodo was also vulnerable to introduced animals like cats and pigs brought by sailors. 
     
  • Pollution: 
    The Baiji white dolphin became extinct in the 2000s due to factors like overfishing and pollution. 
     
  • Introduced species: 
    The dodo was unable to defend itself against animals like rats and pigs that were brought to its island by foreign sailors.