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Experts say fishing methods are to blame, with one subspecies in New Zealand down to fewer than 100 mammals. Hector's dolphins are found only in New Zealand where the population has fallen to 7,000.

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New figures show 26% of all sharks, rays and related species in the north-east Atlantic are threatened with extinction. Seven per cent are classed as critically endangered, while a fifth are regarded as near-threatened.

The practice of feeding predatory carnivores in zoos and wildlife parks live "prey", has been discontinued in most countries for many years. In China, however, it is still widely practiced today.

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Physics students learn the speed of light, c, is the same for all inertial observers but no one has ever actually measured it in one direction.

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Learn or teach chemistry. Find lecture notes, laboratory experiments, homework help, and other chemistry essentials. Chemistry topics, lab basics,look up element facts, see chemical structures, get definitions and browse chemistry charts and tables.