The sentence "His bat-like ears twitching, tilting toward the least sound" contains the literary device called simile, which compares two different things.
The literary device known as simile consists of comparing two different things. This device relies on the use of the words "as" or "like" to make such comparison. The purpose is to show that one of the things being compared has a quality or characteristic that is also found in the other.
For example:
That is what we have in the sentence "His bat-like ears twitching, tilting toward the least sound." Here, a person's ears are being compared to the ears of a bat. The purpose is most likely to imply that this person can hear well or that he pays attention to every sound.
We can conclude, therefore, that the literary device used in the sentence is simile.
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