What Am I Riddles

Question: What goes back and forth constantly, but never in a straight line?

Question: I come in varieties of color and am found almost year round. My house is tall and my only fear is the cold. What am I?

Question: And, here I am! Between sea and land! Connecting one to another Bringing two friends together! What am I?

Question: I attach to your hip and I sing all day.
All I want to do is play.

Question: It breaks away from its pack. It creates holes in its victims. It can travel for miles and then disappear. It is part of a dying breed. What is it?