Answer:
Things here are usually tagged with red stickers.
I have a mouth on my head and eat everything.
What has a head and a tail but no body?
I am a protector. I sit on a bridge. One person can see right through me while others wonder what I hide.
I am seen in the water. If seen in the sky I am in the rainbow a jay's feather and lapis lazuli.
When is it bad luck to see a black cat?