[taniab]

Is it possible that a bad angle/lighting could result in a green winged teal looking like it has a purple eye line instead of a green one?

[DavidWong]

I had a Bushtit with blue back, wings and bill.

http://www.flickr.com/photos/68635735@N02/7674392794/

It was pointed out to me that this was due to photo-processing.

David Wong

[taniab]

http://www.flickr.com/photos/91742093@N05/8385975218/

Hopefully at least one of those works

[Birder2000]

The lighting on a Green-winged Teal can make the bird's green colouring look purple. Here is an example of a bird I saw at Burnaby Lake a year or two ago. The lighting makes parts of the bird look blue.

[taniab]

Thanks for solving the mystery, David and Liron!

Good thing I stopped trying to drive myself nuts ID'ing it and asked the question here