One day in 2000, local naturalist Mark Evans, unexpectedly spotted fifty or so Ravens emerge from a conifer stand he was walking through. Intrigued, he returned a few days later to confirm his theory that these birds were roosting in the area.
Since that first encounter, he has returned each month to count the birds, building a body of evidence showing how this roost fluctuates in numbers through the year and changed over the decade.
The BTO’s Roosting Survey has been collecting fascinating records all winter and will draw to a close at the end of February.
Taking part is easy and great fun: participants choose one evening to see if, and how many, birds use a nest box, roosting pouch, or other cavity in their garden for a kip. Observations can be made using a nest box camera, by eye at dusk or dawn, or by counting bird droppings in a nest box on the afternoon before and the morning after the chosen evening. With dusk still descending quite early, the Roosting Survey can be fun for the whole family.