The largest ray in the world (up to 8m wide!), the giant manta is a graceful and gentle creature. They can make migrations across the oceans, finding their way by following topographical maps ...

German engineering firm Festo has created this flying manta ray. Dubbed the Air_ray, it’s a balloon made of an aluminum-vaporised “PET foil”. Inflated with helium, the Air_ray’s propulsion ...