Records

54. Burke Museum nest record cards=38 (class cards=7); egg sets=16.

Counties

Adams=1; Douglas=1; Grant=50; Yakima=2.

First-egg dates

Earliest 22 April (Julian day 112); latest 11 June (Julian day 162).

Clutch size

33 usable records. Mean 4.4 eggs.

The maximum clutch size for shorebirds is almost always 4 eggs, with 5 egg clutches laid by the same female being very rare. Thus, the six clutches of 5–8 eggs likely represent laying by two females. Female-female pairs sometimes form when there is a shortage of males.

Season and clutch size

There was no significant change in clutch size through the season. However, clutches larger than 5 eggs tend to occur later in the season (p=0.13).