Ring-necked Ducks are the most commonly seen of the Aythya ducks, and are common winter residents, often lingering long into the spring.  Usually fewer than 10 individuals are seen, but groups of 10-20 are not uncommon. On 1997-12-18, Brian Bell counted 32.

The best place to look for them is on the ponds at Marymoor West (aka the Rowing Club), but they are also frequently seen in the slough and on the lake.