Threatened Plants and algae

Black lechwe are found in large, loose herds in which no strict social system exists.
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A single southern wood ant colony can consist of more than 250,000 individual workers.
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Flocks of red knots winter on large tidal mudflats, rocky shores and beaches.
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Atlantic herring are often found in vast shoals, covering several square kilometres of water.
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Laysan ducks have a novel way of catching flies, running through swarms with their bills open.
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The African river-martin, the most primitive living swallow, is usually observed in large flocks.
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