I would postulate an animal that lives at the far reaches of the atmosphere, “hanging” in space and moving by electric/mechanical energy originating in its thought processes. Doesn’t need to eat, as it exists in a state of not quite becoming, a nebulous almost-form caught at the transition stage between consciousness and form. Very difficult to see, but occasionally they do dip closer to us and can be witnessed with infra-red cameras or goggles. When seen, they resemble slightly jelly fish without trailing tentacles or more accurately giant cells that constantly change shape, as the edges are continually shifting back and forth between thought and energy. They can be called down by attracting attention to oneself.