A "call" is a sound that an animal makes to advertise its presence, warn off rivals, attract a mate, etc. Animals may have different calls for different purposes, so a call made in any particular situation is not necessarily the sound that the animal usually makes (though of course it may be). The word "call" typically (not always) suggests a reasonably loud sound, but "make a call" does not itself mean "to utter loudly that sound or call", it just means to utter it.
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