The Tiyu-an is a flightless variant of the Manananggal in Philippine folklore. It can, however, leap great distances and jump considerable heights. It appears as a normal person but it can extend its tongue into a long, tubular proboscis with a pointed tip. Moreover, in the olden days most Tiyu-ans were stooped due to their habit of prowling under elevated houses to suck the voided phlegm of a tubercular or the insides or fetus of a person.
The Tiyu-an keeps a puppy that never grows old and never dies. The puppy is inherited from the parents and it is actually the master, the Tiyu-an its slave. The Tiyu-an also has a familiar in the form of a bird that helps it locate suitable victims. At night or the wee hours the Tiyu-an will set out, following the bird on foot. When the bird finds a target it perches on the roof of the victim's house and call the Tiyu-an with a rapid succession of chirps such as "tik-tik-tik". The Tiyu-an will then jump onto the roof undetected and will look for a hole or make one. It will then extend its tongue through the hole, and special taste buds help it pinpoint the exact position of the victim.
The tongue will pierce the victim's abdomen and inject an anesthetic that slowly dissolves the heart, liver and other entrails (and fetus if the victim is a pregnant female). The digested insides and blood or the fetus will then be sucked out by the Tiyu-an through its tongue.