Humpback whale 'lobtailing' in Chatham Strait. The whale brings its tail down hard on the surface of the water - a sound that can be heard for a distance of several hundred metres underwater. Taken by kayaking photographer Duncan Murrell
pearlescent pink fractal Noun A curve or geometric figure, each part of which has the same statistical character as the whole. Adjective Relating to or of the nature of a fractal or fractals: "fractal geometry".