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[Are bats kosher?]

Bats are pretty similar to mice which are not kosher. My first guess was no. And I was right. From the source itself:

https://books.google.com/books?id=l0GXha1h3eIC&pg=PA91&lpg=PA91&dq=tinshemes+kosher&source=bl&ots=yeVaVz13TL&sig=ACfU3U0LeyNLvn8pmY62lWCXZOSFB_AqUg&hl=en&sa=X&ved=2ahUKEwjJhP3R2Z7nAhWBBs0KHdqNB4QQ6AEwA3oECAkQAQ#v=onepage&q=tinshemes%20kosher&f=false
[And these you shall hold in abomination from among the fowl; they shall not be eaten; they are an abomination; the nesher, the peres and the azniyah; 14. The da’ah and the ayah according to its species; 15. the orev according to its species; 16. the bas hayaanah, the tahmas, the shahaf and the netz according to its species; 17. the kos, the shalakh and the yanshuf; 18. The tinshemes, the kaas and the raham; 19. the hasidah, the anafah according to its species, the duchifas and the atelef.]

Whether a bat is an atalef or a tinshemes, it’s treif, unless I’m reading this wrong.