Wak-wak

Wakwak
Title	Wak Wak (Wuk Wuk)
Description	Philippine ghoul
Gender	Male/female
Region	Philippines
Equivalent	Ekek, Manananggal

The Wakwak is a vampiric, bird-like creature in Philippine mythology. It is said to snatch humans at night as prey, similar to the Manananggal and the Ekek in rural areas of the Philippines. due to its ability to fly. The difference between the Mananggal and the Wakwak is that Wakwak cannot separate its torso from its body while the Manananggal can. Some believe it is also a form a vampire takes. Other people contend that a "Wakwak" is a Philippine night bird belonging to a witch.

The sound of a Wakwak is usually associated with the presence of an Unglu (vampire) or Ungo (ghost or monster). It is also believed that this monster is called "Wakwak" due to this sound it makes when it flaps its wings while flying. When one hears the Wakwak, it is looking for possible victims. If the sound of the Wakwak is loud, it means it is far from you. Otherwise, it is near and worse yet, it is about to attack. It slashes and mutilates its victims and feeds on their hearts.

The Wakwak is often described by old folks to have long sharp talons and a pair of wings similar to those of a bat. It uses its talons or claws to slash its victims and to get their heart. Many say that its wings are also sharp as a knife.

The sound that a tiki, tike or teke (common house gecko) makes usually at night when out of sight was discovered by an American who spent much time in the Philippines to be the source of the sound everyone was saying was a "Wakwak".

Also Wak-Wak in early Philippine history was the Kingdom of Wak-Wak along with the Kingdom of Zabag and were situated in Pampanga

...
Wikipedia