It's bird-like. [The picture might be more clear now. It's a human head, but with a bird beak and wings, plus bird legs and feet with extra sharp talons. Its body is serpentine though.]

It is said that in 1334, it began to appear in the night sky over the capital's ceremonial hall and cry "itsumademo!" It is said it was born from all of the spirits abandoned dead, and would fly around, crying for them in sympathy.