Which white-crowned sparrow will only sing the species-typical song in adulthood?

Question

Quizplus · Accepted Answer

Male white-crowned sparrows learn their species-typical song during a sensitive period, which ends around 100 days after hatching. If they are exposed to abnormal songs during this period, they will incorporate elements of those songs into their own adult song. However, once their song has crystallized, usually around 200 days after hatching, it cannot be altered. Therefore, a male raised in isolation, exposed to tapes of white-crowned sparrow song before 2 months of age, and deafened after his song has crystallized will only sing the species-typical song in adulthood.

Which White-Crowned Sparrow Will Only Sing the Species-Typical Song in Adulthood