Rod Williams / Small black ants (Lasius niger) alates massing in a garden shed Brockley, Lewisham, London, England, UK. July.
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Nick Upton / Gorse spider mites (Tetranychus lintearius) massing outside silk tent covering Gorse bush (Ulex europaeus) ready to migrate to other bushes. These mites are spreading in the UK and are used for biolog...
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Nick Upton / Gorse spider mites (Tetranychus lintearius) massing outside their silken tent shrouding a Gorse bush (Ulex europaeus) ready to migrate to other bushes. These mites are spreading in the UK and are used...
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Anup Shah / Eastern white-bearded wildebeest (Connochaetes taurinus) and Plains zebra (Equus quagga burchellii) mixed herd massing by the Mara River. Masai Mara National Reserve, Kenya.
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Ann & Steve Toon / Common starlings (Sturnus vulgaris) flock on telegraph wires, Islay, Scotland, UK
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Anup Shah / Aerial view of herd of Eastern White bearded wildebeest (Connochates taurinus albojubatus) massing at the Mara River watched by tourist vehicles, Masai Mara National Reserve, Kenya 2008
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Nick Upton / A large flock of migrant Wood pigeons (Columba palumbus), massing together before crossing the Pyrenees mountains, Trie sur Baise, Haute Pyrenees, Gascony, France. December 2009
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Nick Upton / Two large flocks of migrant Wood pigeons (Columba palumbus), massing together before crossing the Pyrenees mountains, Trie sur Baise, Haute Pyrenees, Gascony, France. December 2009
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Andy Rouse / Common starling (Sturnus vulgaris) flock massing at dusk at winter roost, Gloucestershire, UK
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Andy Rouse / Common starling (Sturnus vulgaris) flock massing at dusk at winter roost, Gloucestershire, UK
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Andy Rouse / Abstract of Common starling (Sturnus vulgaris) flock massing at dusk at winter roost, Gloucestershire, UK
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Andy Rouse / Common starling (Sturnus vulgaris) flock massing at dusk at winter roost, Gloucestershire, UK
