Answer:
I have fangs and enjoy piecing holes with a single bite.
I have a little pool with two layers of wall around it. One white and soft and the other dark and hard. What am I?
Before I grow I'm small. When I'm old I grow tall. When I die I give a mighty fall.
If you have me you want to share me. If you share me you don't have me. What am I?
In all the world none can compare I am a tiny weaver my deadly cloth so silky and fair.
When is it bad luck to see a black cat?