Cuegle
A creature from Cantabrian mythology with an animal body and a human face. It is a deformed being: it has three eyes, one red, one blue, and one green, three arms, and enormous hands without fingers.
Of whitish blood, it is a highly voracious creature. It has five rows of teeth and five stomachs, which allow it to devour all manner of animals and children, both living and dead.
If it drinks milk, the cuegle swells up until it dies. But no one attempts to kill it, because according to legend, when it dies a natural death, worms emerge from its body which then turn into slugs and bring good luck.