Some times when I get up early for some bird photography there is still a lot of fog above the river or the wetlands of the Inn River. In these situations it is very nice to watch the first sunrays and when the sun comes out the fog offen dissapeares very fast. And then you can see further and further and maybe even some seldom birds can be seen when the fog rises. Because the early morning and the early evening are some really nice times of the day for bird photography i often use these times for some photography, the probability to get some nice shots is a lot better during this time.
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From @florian-glechner