https://dxnest.com/yen-tinh-che-loai-cao-cap-50g/
https://dxnest.com/yen-tinh-che-loai-cao-cap-100g/
The Tree Swallow, like all swallows and martins, is a swift, agile, water-loving bird. Its wings beat rapidly and its throat vibrates to create a bubbly, liquid twitter. This chatty species gathers in large flocks before migration, sometimes in the hundreds of thousands. It nests in open, grassy places and in old woodpecker holes in trees. If these natural places are too few, Tree Swallows readily adopt manmade nest boxes. As a result, in the last half of the 20th century, many pe
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