Approx 13 mm in length
In a koi pond
This feral bird has lived in my dad's neighborhood for years. He hates it.
A pair of finches today. Hopefully with more ID'able marks.
Update: given the pale stripes on the head, I'm calling these Purple finches: http://www.pbase.com/rcm1840/purple_finch_vs_house_finch
Seen during a volunteer habitat restoration event.