To provide a little bit of context here; rats are pretty big, and can be difficult to handle when you are doing approved in-vivo studies. When entering a tunnel like structure, the plastic cone, their instinct is to scoot forward. So once they scoot, you close the plastic cone behind them. Now you can easily flip them on their back and administer a sub cutaneous, or intraperitoneal injection of what ever medication you are doing in-vivo studies on through the plastic. Doing your injection cleanly and quickly minimizes the stress on the animal. For someone like me, who wasn’t comfortable handling them, it made it easier for me to do the work as quick as possible, less stress for everyone involved.