The difference between nidicolous birds and nidifugous birds are:

Nidicolous birds

  • Birds which hatch help-less, feather less, underdeveloped young ones.
Birds of The World: SPARROWS

Image Source: carolinabirds.org/Images5LG/Sparrow,_Eurasian_Tree_Laitche.jpg

  • The young ones stay in the next for some time after hatching.
  • Example: Sparrow, pigeon.

 

Nidifugous birds

  • Birds which hatch well developed young ones.
  • The young ones leave the nest immediately.
  • Example: Chicken, duck.