Another excellent location for Hutton's Vireo in the Vancouver, BC area is
Campbell Valley Park. Particularly in the region just south of the 16 Ave.
parking lot. The birds in this area seem to behave differently from those
observed in the previously posted UBC area.

>There's an interesting seasonal aspect to ID'ing Hutton's Vireo Vireo
>huttoni. In winter, they join mixed-species forage flocks and in that
>context resemble Ruby-crowned Kinglet Regulus calendula. At this time of
the
>year these flocks tend to stay fairly high in mature forest of the type
>described above. In summer, though, they nest lower down in shrubbier
>habitat and an observer will more often see them sitting near eye-level,
>resembling nothing so much as an odd-loking greyish Pacific-slope (Western)
>Flycatcher Empidonax difficilis. In ID'ing this species, one often needs to
>take seasonal and habitat context into account

In summer, the birds I've observed, are usually found singing from high in
the canopy, prehaps a territorial display.
In winter, foraging in mixed flocks (chickadees and kinglets), no more than
3 or 4 metres from the ground. They seem much more approachable at this time
of the year.
I do concede my observations have been restricted to this particular park
and only for a period of the last four years.

Remaining eager to glean more from this cornucopia of knowledge.
Brian Scott
PISHER at msn.com