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Thousands of sand martins are carving tiny nest holes into the sandy banks of the Yellow River, turning the cliff face into a natural "honeycomb." In nearby woods, grey herons and black-crowned night herons are busy raising chicks. April to June is peak breeding season for these birds. Researchers have stepped up patrols to give them a safer place to nest, hatch and grow.

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Thousands of sand martins nest along Yellow River as breeding season begins