The nudibranch waving its hair underwater, in an imitation of saying hello. BALI, INDONESIA: PICTURES of an adorable ?GREEN SHEEP? have been captured. One image shows an eight-millimetre costasiella sp sheep nudibranch waving its hair underwater, in an imitation of saying hello. Another image shows the nudibranch hanging upside down underwater. These images were taken in Tulamben, Bali, Indonesia by Underwater Photographer ?lvaro Herrero (36) from Spain. ?lvaro clicked these pictures using a Nikon d500 macro lens 60mm and a +10 diopter from a few centimetres away. It took ?lvaro three dives ranging an hour each to click these images, he dove 12 metres underwater to capture the nudibranch. mediadrumimages/@mekanphotography