Raven

The raven is a bird that harasses the main character quite a bit. It usually perches somewhere and waits for the hero to come near. When this happens, it either swoops at the hero or flies out of range. It will may make more than one attempt or it may fly away for good. Sometimes, the Raven will disappear after impacting the hero. The raven behaves similar to a Crow.

Castlevania: The Adventure
The Raven (called an Eagle in the Game Boy Nintendo Player's Guide and a Death Bird in Japanese) flies straight from one end of the screen to the other, but then doubles back, swoops low, and swoops quickly towards the hero.