Donna,
You reported on the following.....

At Howarth Park we saw a mixed flock of birds in one area which included:
Hutton's Vireo
Cassin's Vireo
Red-eyed Vireo
Orange-crowned Warbler
Nashville Warbler
MacGillivray's Warbler
Wilson's Warbler
Black-and-white Warbler (we had good views of this bird)....

Can you give us a more precise location? What time of the day? What sex was the black-and-white warbler?

Greg Toffic
Everett