These photos pay special attention to the multi-faceted vitality of birds in the 3 phases of spring:
1. Early spring.
2. Mid-spring.
3. Late spring.
The viewers may notice some of the blurry edges of the birds in this series of photos. On pixel level, the blurry edges of the bird consist of white dots. ONE of the causes of these white dots is the reflection of strong light in daytime by the very thin and tiny (possibly damaged) furs of the birds. The tiny furs of the birds play the same role as the dusts discussed in a DCFever article黑夜光點之謎: 灰塵對光線散射，同時與其他景物一起被攝進照片中。……..小型 DC 和銀鹽照相機及 D-SLR 相比，小型 DC 的鏡頭實際焦距是非常之短，因此景深也比 D-SLR 及傳統相機深很多。景深越深，畫面上所有景物就越清晰，甚至接近以超焦距方法的拍攝效果。因此，環境中幾乎所有距離的景物（包括反射了閃燈強光的灰塵）也在照片中清晰成像。由於傳統相機或 D-SLR 的景深比較淺，灰塵因為 Out Focus 而變得非常淺色、大面積而且模糊，所以很難發現此現像。
The shallower depth of field of big telephoto lens prevents those expensive lenses to record those tiny furs of the birds on a photo. In the real world, these wild birds should not have smooth edges because they do not use hair-conditioner after they get wet by the river water. Their furs are constantly damaged by water, wind and fighting. The smooth edges of birds recorded by big telephoto lens are just an artifact of the very shallow depth-of-field. Hence, for this aspect and for this aspect ONLY, the blurry edges in my photos actual indicate a superb image quality due to the deeper depth of field offered by compact digital cameras.