ChristianAnswers.Net WebBible Encyclopedia
The Hebrew word atalleph', as in (Lev. 11:19; Deut. 14:18) implies “flying in the dark.”
The bat is listed among the “birds” in the list of unclean animals.
To cast idols to the “moles and to the bats” means to carry them into the dark caverns or desolate places where these animals may live (Isa. 2:20), i.e., to consign them to desolation or ruin.