Ekek (or Ek Ek) were creatures who are bird-like humans. They are winged-humans who at night search for victims. They hunger for flesh and blood. They were usually describe by old folks as flying creatures that look like the Manananggal but they can't divide their body. They were describe to have wings and looks like a bird. Except for Manananggal, they were also associated to Wak Wak because to some the same characteristics. The only difference between a Wak Wak and Ekek is that Ekek have a bill of birds and Wak Wak don't have.

The Ekek can transform into a huge bird/bat at night and prowls. The Ekek looks for a sleeping pregnant woman. Then it extends a very long proboscis into the womb and kills the fetus by draining its blood. It is said that while this is taking place, a "ek-ek-ek" sound is often heard. In some stories, the Ekek is an aswang's familiar, said to confuse people by its "ek-ek-ek" sound. If the Ekek is near, the sound would be faint so that people hearing it would think that the aswang is still far away.

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