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Sand Martins (Riparia riparia), newly arrived in spring, flitting around and perched on sandy sea cliff where they will excavate nest burrows. Cornwall, UK, April.
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Nick Upton / Sand Martins (Riparia riparia), newly arrived in spring, flitting around and perched on sandy sea cliff where they will excavate nest burrows. Cornwall, UK, April.
Sand Martins (Riparia riparia), newly arrived in spring, establishing nest sites on sandy cliff where they will excavate burrows. Cornwall, UK, April.
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Nick Upton / Sand Martins (Riparia riparia), newly arrived in spring, establishing nest sites on sandy cliff where they will excavate burrows. Cornwall, UK, April.
Eastern Pocket Gopher (Geomys sp) showing teeth which are used to excavate burrows, North America
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Norbert Wu / Eastern Pocket Gopher (Geomys sp) showing teeth which are used to excavate burrows, North America
Eastern Pocket Gopher (Geomys sp) showing teeth which are used to excavate burrows, North America
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Norbert Wu / Eastern Pocket Gopher (Geomys sp) showing teeth which are used to excavate burrows, North America
Illustration of 'Strata of Tilgate Forest in Surrey' showing Gideon Mantell (seated) while two workmen excavate a partly exposed fossil spine of Iguanodon. The strata are labelled as: 1 Loam, 2 Sand a...
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Paul D Stewart / Illustration of 'Strata of Tilgate Forest in Surrey' showing Gideon Mantell (seated) while two workmen excavate a partly exposed fossil spine of Iguanodon. The strata are labelled as: 1 Loam, 2 Sand a...