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Ammocoetes can grow from 3–4 inches (8–10 centimetres) to about 8 inches (20 cm). [ 53 ] [ 54 ] Many species change color during a diurnal cycle , becoming dark at day and pale at night. [ 55 ] The skin also has photoreceptors , light sensitive cells, most of them concentrated in the tail, which helps them to stay buried. [ 56 ]