kashrut kosher - Why does Torah consider Bats as birds?

It seems from Parashat Re'eh (Deut 14:18):

וְהַחֲסִידָה וְהָאֲנָפָה לְמִינָהּ וְהַדּוּכִיפַת וְהָעֲטַלֵּף׃

the stork, any variety of heron, the hoopoe, and the bat.

that Torah considers BATS as birds. Though scientists classify them as mammals. I'm preparing a class on this Parsha and would like to hear comments about this difference.