Most dolphins are confined to a 750 mile stretch of the river and divided into isolated populations by six barrages. They have adapted to life in the muddy river and are functionally blind. They rely on echolocation to navigate, communicate and hunt prey including prawns, catfish and carp.
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[1, 6â8]), most commonly using a so-termed backaction evading, or quantum nondemolition, measurement. The simplest form of a backaction evading measurement, proposed more than three decades ago [1], is a stroboscopic measurement of the position of a mechanical oscillator (Fig.