A large emergence of bats from the Phoenix Bat Cave appeared on the National Weather Service radar around 9 p.m. on Saturday.

According to a Facebook post from National Weather Service Phoenix, a large number of bats emerged from a bat cave near State Route 51 in the Biltmore area Saturday night. The movement of the bats appeared on the weather radar as a burst of green.

Catching bat movements on the radar is not unusual, weather service officials said, and the large emergence is likely part of the animals’ daily cycle.

This article originally appeared on Arizona Republic: Large bat emergence caught on Phoenix weather radar