The sand martin (Riparia riparia) is the smallest and least numerous of British Hirundinidae (swallows).
Up to 225,000 pairs arrive in the UK to breed in the summer, mostly from tropical West Africa, which compares with 620,000 house-martin pairs
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The sand martin (Riparia riparia) is the smallest and least numerous of British Hirundinidae (swallows).
Up to 225,000 pairs arrive in the UK to breed in the summer, mostly from tropical West Africa, which compares with 620,000 house-martin pairs
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