Bats

Gomantong Cave is home to over a million bats from a variety of bats species, including the wrinkle-lipped bat, the Philippine horseshoe bat, and the fawn leaf-nosed bat.
One marvelous spectacle is to see the mass bat exodus from the cave every night at sundown, heading into the jungle to feed on insects, fruit, and nectar. They come out literally in clouds and the scene last for an hour or more. Latr I will add a video link.