And as one species thins out, it falls off the menu to be replaced by another.

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The researchers estimate that the ocean may be home to as many as one million species in all-likely not more.

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It is as if they are one big species with lots of differently colored males.

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As would be expected, the one species that feeds almost exclusively on mistletoe berries, the aptly named mistletoebird, vanished from the culled woodlands.

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In our pre-linguistic, less individualistic childhood as a species, we depended on one another for survival, and leadership was both essential and instinctive.

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Taxonomists do not always get it right first time, of course, and what looked like one species may rightly later be seen as two.

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Dr Fleischer's tree also suggests it may be time to abandon the Canada goose as a distinct species, and elevate its many subspecies one rung up the taxonomic ladder.

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One of them, a retired union coal miner, was identified to me as if he were a rare species of bird.

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For example, according to Californian law 13 species of rockfish can be labeled and sold as Pacific red snapper, but the FDA allows only one.

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