| A study in 1964 proposed that when a host species such as a firefinch splits, the corresponding indigobird species splits, too. |
| Her daughter, genetically an indigobird, imprinted on her Melba Finch foster parents and then mated with a male paradise whydah mimicking Melba Finch song. |
| Soug discrimination suggests premating isolation among sympatric indigobird species and host races. |
| In the next generation, her daughter is genetically an indigobird but imprints on her Melba Finch foster parents and learns their songs. |
| In the first, a female paradise whydah mates with a male indigobird, then lays an egg in a nest of her usual host, Melba Finch. |
