Translation guide
The English word "bat" has two main meanings: a flying mammal and a piece of sports equipment. These are completely different words in Japanese, so context is essential.
Referring to the nocturnal flying mammal.
There are many bats in the cave.
Bats are nocturnal.
Referring to the piece of equipment used to hit a ball in sports.
Referring to the act of batting in sports.
Using バット for the animal or コウモリ for sports equipment will cause confusion. Always check the context.
卓球のラケットを忘れた。
I forgot my table tennis bat.