I watched this stoat bring in a young bird and take it into a large bush then go off and bring several more back. I don’t know if the stoat was bringing food to its young or just caching them. This and many other images were taken at RSPB Minsmere at the same time the BBC team were there filming Springwatch. I think this may have been their featured stoat.
Sand martins nest in sandy river banks or sandy coastal cliffs. The males dig burrows in the cliff and the females then turn the burrows into nest chambers. This bird had been gathering damselflies to bring back to the nest.