M Verbeek 1960 Calidris canutus (8) neighborhood of the nest, and is primarily concerned with feeding. The exposed position of the nest, does not necessitate his or her presence near the nest, to warm the incubating bird in approaching danger (See notes of 2 July). Why does the Semipalmated not do the same thing, or the Red-backed for that matter? It might well be that the Sanderling has a similar system of nest attendance. In the Sanderling I noticed only the female on the nest, whenever I checked the nest during the day. The male was around, on the shingly area at large, but not near the nest. It could well be that he incubated at night, allowing the female to feed. The Sanderling nest is exposed too, and this allows the incubating bird to get off the nest, without the necessity of being warmed by the mate. The nest at the CRRLE (#31) had four cold eggs and they as well as the nest were cold. So it seems that in this nest, and in the case of Nest 20, from both of which we shot the male, the female did not come back. Watched a bird, accompanied by three chicks from 15:50 to 17:50. During this time they were attended by one adult. This bird brooded the young for 9 minutes from 17:21 to 17:30. Then the adult and young fed for 3 minutes, after which the adult flew away from 17:33 to 17:37½. The adult flew away for a distance of some 75 m. On returning the bird brooded the young from 17:37½ to 17:46, after which they all fed again. Once, before I started recording time, the adult flew off, leaving the young alone for a while. I went back to this nest in the evening and shot the adult, which turned out to be a male (Testis 3½ x 1½, weight 29.4 (badly shrivelled)).