They don't fly south for several months. Perhaps they were young ones?
Swifts usually leave soon, staying a few months only to breed. We saw a few yesterday.
See https://www.rspb.org.uk/birds-and-wildlife/house-martin .
Simple QRP projects, 10m, 8m, 6m, 4m, FT8, 160m, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff, some not related to amateur radio.
See https://www.rspb.org.uk/birds-and-wildlife/house-martin .
When we got back from holiday we found these growing in our two tomato bags. Home grown always smell and taste delicious.
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