https://dxnest.com/yen-hu-chung-san/
The sight of swifts, swallows and sand martins wheeling through the sky is a classic summer spectacle. But try telling them apart in the air and it can be tricky. But with a bit of practice you can soon separate these high-flying long-haul migrants. Swifts, swallows and sand martins spend most of their lives on the wing – flying between their winter and breeding grounds and back again, eating, nest building, mending the nest and rearing young. They rarely land and their feet, although webbed, haven’t developed, so they can’t walk (but they often cro
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