单选题 Which of the following sentences would be the main idea of the section called "Animal Talk"?

A、 Birds sing songs that say "This is my place."
B、 Many animals communicate with signals like sounds,odors,colors,etc.
C、 Like any parrot, Alex can copy the sounds of the human voice.
D、 Wolves and wwhales are able to tell each other what's on their minds.
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