Translation:You can thank the bats for your bananas.
Bats pollinate bananas, and help disperse their seeds.
However, the bananas you find in the store are seedless, so you can't thank the bats for those particular ones. Unless you want to, of course; I won't stop you.
Don't listen to her she will stop you at all costs from thanking the bats for the bananas at the store. I know this from personal experience
Interesting! My mom was going to guess that the guano fertilizes the trees or something.
I understood the sentence differently. Coming from a tropical country, where windows are often left open even during the night, it's not uncommon to have a bat come into your apartment to steal your bananas. In this case, the sentence would have a touch of sarcasm. ;)