An invisible force

A few frames from a short sci vis project. A little tapole, like all living bodies, creates magnetic fields. This invisible force (invisible to humans that is) is picked up by a sinister predator. The platypus is armed with magnetic sensors in its bill. It swims with its eyes closed as vision is not the best sense to have underwater. Particularly when the pray is hiding, the water can be murky, while water conducts electicity.