What I did:
- import the picture in gimp
- made a new white layer
- made a new layer from visible
- fuzzy select the all the white areas from the picture
- bucket fill the section with black
- selection to path
- select none
- stroke path with black brush (2. Hardness 075 / Size 5.00)
- merge path layer layer with the black bird
- done
- import the picture in gimp
- made a new white layer
- made a new layer from visible
- fuzzy select the all the white areas from the picture
- bucket fill the section with black
- selection to path
- select none
- stroke path with black brush (2. Hardness 075 / Size 5.00)
- merge path layer layer with the black bird
- done