Sand Martin colonies

Working in Abercynon this morning it was great to see dozens of Sand Martins using as nests the weep holes in the stone retaining wall of Abercynon railway station. Some were no more than 6ft high from the pavement. I’ve seen similar use of weep holes in Pontypridd and Porth, whilst in Pontygwaith their using holes in a wall right next to a busy road.

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