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arbitrary arrest of opposition leaders and activists in their report, and they have, of course, expressed concerns over the last few years in a clamp down of opposition voices in bangladesh. researchers say they've discovered that sperm whales live in human—like clans, with distinctive cultures, and even dialects. the scientists used underwater microphones and drones, to examine the sounds and behaviour of the animals. jon donnison, has that story. low-pitched clicking. the clicks and clacks of a sperm whale. and, as you might expect from the creature with the biggest brain on the planet, their chitchat has more to it than meets the ear. this latest research, published in the royal society open science journal, found there are at least seven separate clans of sperm whales in the pacific ocean, each with its own distinct culture and vocal dialect. while the sperm whales sound very simple, their patterns of clicks is a bit like morse code. the two clans we discovered