We've recently been discussing in our lab the benefits and downsides of transporting animals from our animal facility (vivarium) to behavior rooms in our lab. this involves taking the mice from the facility and walking a few hundred yards outside into out building. I bring the mice in their home cages (quite heavy!) while some put animals in transfer containers (paper buckets) en route to the lab.
Others don't do any such transfer, but rather have a behavior testing facility in the animal facility and do their testing there. This has the advantage of not disrupting the animals too much (no outdoor transport), but the disadvantage is that for long behavior time courses, you're away from your home lab for several hours or the whole day.
This is something that isn't discussed much in method sections, but probably contributes to variability in behavioral experiments. What do you do and why?