Harming an animal species causes that animal 's population to decrease, and habitat loss is the major reason for the decrease in the bird population. Given these facts, what has caused harm to the bird population among the following options:
- feral dogs
 - migration
 - habitait loss
 - amoebae
 - hypothyroidism
 - fuel emmisions
 - Pesticides
 - viruses


 

   habitait loss      