各位老师好，想请教一个关于名词所有格的问题，如下：
In fact, the
19-year-old teenager can imitate the sounds of 50 animals. And it is true that
his mother herself cannot distinguish them from the real ___________ (animal).
这是一道适当形式填空题，答案是animals'。（这里应该是代表animals' sounds）
请问是否名词所有格的功能即可以相当于形容词性物主代词做定语，也可相当于名词性物主代词呢（animals' = animals' sound）？谢谢!
