It gets a little more difficult as the summer progresses to identify warblers. At this time of year the first season appearance of new babies is introduced to the mix as well. Wearing their transitional patterns, colours and design their identification can often be a confusing mystery. I was pretty excited when I first saw this little warbler earlier this week, with its olive cap and very prominent white eye ring! I was quite sure I had found a new life bird to add to my life list, but with a check in my Sibley's, Birds of North America, I found that I had photographed a first winter non-breeding female Chestnut-sided Warbler wearing its August - March seasonal garb. The photo above is of an adult Chestnut-sided Warbler.