Animal I don't like

Can you guess what animal I hate the most?

I have a bad experience about this animal.
Basically most of people don't like this animal.

This animal sometimes (often?) attacks people.
flies and the color is dark.
is believed to bring bad luck.
usually cries in the evening.
can be seen around a dead body or a gabage.
is scary so I never close to this animal.

Do you need more hints?