_Nesting._--We found no large breeding colonies in Saskatchewan but several small ones. The Hay Lake colony referred to above was perhaps the largest, containing 15 or 20 pairs. The nests, found here on June 15, were merely slight hollows in the sun-baked mud on the broad alkali flats bordering the shallow lake; they were scattered widely among the little tufts of short grass which scantily covered the flat; the hollows measured from 3 to 4 inches in diameter and were lined with a few dry grasses. Some of the nests were well formed and somewhat elevated. Although in plain sight, the eggs were not easy to find, as they matched their surroundings perfectly.
On June 14, 1906, we found an interesting little colony of avocets on an island in Big Stick Lake, Saskatchewan, which was also occupied by big colonies of California and ring-billed gulls, common terns, a few spotted sandpipers, and a few pairs of ducks. The avocets, terns, and sandpipers were all at one end of the island, a low grassy point; the ring-billed gulls and ducks were in the central, highest part; and the California gull colony was at the other end. The avocets' nests, ten or a dozen of them, were placed in the short grass near the edge of the beach or on the drift weed lying in windrows on the beach; one nest was partially under a fallen shrub or bushy weed. The nests were made of grasses, weed stems, straws and small sticks, with sometimes a few feathers, loosely arranged around small hollows, from 5 to 7 inches in diameter. Two of the nests held five eggs, the others three or four.
Robert B. Rockwell (1912) found an interesting colony of avocets on an island in Barr Lake, Colo., of which he says:
The nests were all located in very similar locations, among a young growth of cockle burrs not over six inches in height and which had probably grown at least half of that since the eggs were laid. The cockle burrs formed a belt about 10 yards wide clear around the island just below the dense blue-stem and other rank grass with which the Island was covered and on ground that was under water during the high water of the spring although inundated for a short time only. Two of the nests were very crude affairs, being a mere shallow hollow in the sand with a very few dead weed stalks of short lengths arranged around the eggs. The other was constructed in the same manner, but was quite well lined with weed stems, so that the eggs did not touch the ground. There was no evident attempt at concealment, the nests all being placed in small open spaces from six inches to a foot in diameter, and with nothing to protect them; but the color of the eggs was sufficient protection to make them quite inconspicuous.