When I moved to this city, I was annoyed by bat droppings. It opened a door to know about bats. And in August, I went to a bat observation event at night. It was held by a bat museum located in-between Nara and Kyoto.

Bats looks like birds, because they fly freely. But in fact, they are mammals, so their wings are actually their hands. One quarter of mammals in the world are bats. And one third of mammals in Japan are bats. But I still haven’t seen flying bats.

I learned that bats are very beneficial to humans. Because they eat 500 mosquitoes in one night. Summer time is their breeding season. And luckily I could see a rescued baby bat. It was shaking by our glance. Bat detectors informed us its echolocation sound which is around 45hz.

Roughly speaking, their sonar sound is a trace of survivor in the Jurasic period. They live in dinosaur’s shadow. It sounds like they are weak. But in fact, they are enough strong for survive rather than dinosaurs. That is the key to evolve for us, too.