Well, God called called them fowls...We call fowls, birds...
Lev 11:20 All fowls that creep, going upon all four, shall be an abomination unto you.
You know of any birds that travel by creeping on the ground, on ALL FOUR??? I can't think of any at the moment...
If God says bats are fowls, then they are fowls regardless of what scientists say...And when God says some of these 'birds' walk on four legs, I'll believe Him...I don't have to see one to believe it...
God made these things...If I can't figure it out, that's not God's problem...It's mine...