28-30 January 2017 — 38th annual Big Garden   Birdwatch — (last weekend of January every year) 
Count the birds in your garden as part of the world’s biggest survey of birds. More than 519,000 people participated last year. They counted 8,262,662 birds.
 Information:
The Royal Society for the Protection of Birds (RSPB) — the event’s sponsor
“Big Garden Birdwatch: cold snap may bring unusual migrant birds to gardens” — The Guardian