![Proper gravel management may counteract population decline of the Collared Sand Martin Riparia riparia – Avocetta Proper gravel management may counteract population decline of the Collared Sand Martin Riparia riparia – Avocetta](https://www.avocetta.org/cnt/uploads/2019/12/Riparia-riparia-300x205.jpg)
Proper gravel management may counteract population decline of the Collared Sand Martin Riparia riparia – Avocetta
![The Sand Martin Riparia Ripariaor European Sand Martin, Bank Swallow in the Americas, and Collared Sand Martin in India. Stock Photo - Image of africa, natural: 186289476 The Sand Martin Riparia Ripariaor European Sand Martin, Bank Swallow in the Americas, and Collared Sand Martin in India. Stock Photo - Image of africa, natural: 186289476](https://thumbs.dreamstime.com/z/sand-martin-riparia-ripariaor-european-sand-martin-bank-swallow-americas-collared-sand-martin-india-sand-186289476.jpg)
The Sand Martin Riparia Ripariaor European Sand Martin, Bank Swallow in the Americas, and Collared Sand Martin in India. Stock Photo - Image of africa, natural: 186289476
![The Sand Martin (Riparia Riparia). In Europe Sand Martin, Bank Swallow, And Collared Sand Martin In India Stock Photo, Picture and Royalty Free Image. Image 169432435. The Sand Martin (Riparia Riparia). In Europe Sand Martin, Bank Swallow, And Collared Sand Martin In India Stock Photo, Picture and Royalty Free Image. Image 169432435.](https://previews.123rf.com/images/karelbock/karelbock2105/karelbock210500210/169432435-the-sand-martin-riparia-riparia-in-europe-sand-martin-bank-swallow-and-collared-sand-martin-in-india.jpg)