![]() ![]() After four weeks, the young Bald Eagles also develop wail and Peal calls. The cheeping call of the nestling serves as a way to beg for food, an alarm call, and a communication with adults (Kussman, 1977). They could then observe whether this Bald Eagle grew to have the same call as other adult Bald Eagles or if it was different or if it did not learn a call at all. To test this, scientists could raise a Bald Eagle in captivity without interaction with any other birds. ![]() Since there is no direct evidence, further research is needed to determine whether Bald Eagle song is learned or innate. As the bird ages, its sounds become more complex and have a greater volume variance and by day thirty of their life their call has similar characteristics to the adult Bald Eagles call even though there is no direct evidence that offspring learn their calls from adults (Buehler, 2000). After hatching, the nestlings make a single- note tonal peep (Gilbert et al., 1981). Young Bald Eagles make different sounds than the adults. The function of this strange vocalization is unknown so further research on the function of the vocalization is needed. It can be written to sound like ki-ki-ki-ki-ki-ki-ker (Stalmaster, 1987). Its call is compared to a snickering laugh and consists of seven or eight notes sounded quickly and haltingly in a way that sounds very labored. ![]() For such a large bird, the Bald Eagle’s voice is surprisingly weak. ![]()
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