FIGURE 2.

Results of the Layer method: this yields a precise count of the birds incubating in a breeding colony, as well as identification of the species and their activities, that is, whether a bird is incubating or standing on the ground. Red circles – incubating Black‐headed Gulls, black circles – Black‐headed Gulls standing on the ground or in the water, yellow circles – incubating Greylag Geese and nests with eggs, blue circles – incubating Common Terns, white squares – birds performing an unidentified activity, or possibly dead