According to the Visayan Folklore and to my grandparents and great grandparents story, there are 2 separate entities that likes to eat unborn babies; tik-tik (featured in this episode) and the wak-wak (bird like creature). A tik-tik like in this episode was portrayed close enough to folklore's description, it looks true and convincing and kinda makes me feel eerie to think if they really exist. It got it name from it's ticking souund that it makes. Tik-tik, has no wings so they couldn't fly and here is where the Wak-wak comes in. A wak-wak is a bird like creature, describe as a big bird's head with long bat-like wings, beak with fangs and a deep dark red eyes. It also got it's name from the sound it makes when it flaps it wings. they say that if you can hear it, it means that it's far away and if not, you better start running.
A tik-tik and a Wak-wak has a symbiotic relationship, that's why you hear their sounds at the same time. I just hope that these would just stay as a legend and nothing else.