Sam England and Daniel Robert, biologists at the University of Bristol, report that at least three types of caterpillars are capable of sensing and responding to an electrostatic field generated by a predator. Sam England and Daniel Robert, biologists at the University of Bristol, report that at least three types of caterpillars are capable of sensing and responding to an electrostatic field generated by a predator. Plants & Animals Ecology Phys.org – latest science and technology news stories