My mom is looking for the title of this short story that she read when she was younger, I'd say between 1960 and 1975. It was gathered in a sci-fi collection of stories, that was published regularly and that she used to read. Although one could say that it doesn't sound like a science-fiction story, the decision by the writer to compare animal and human lifestyles, and to compare things happening at very different scales, and switch the "size" of his/her focus to very small things and create a fictional plot involving insects or animals makes it science-fiction-like I think.
In the story, a man wakes up in his house, opens the windows and looks out to the beautiful nature around him. He believes a fine day is about to start. But a shift in perspective reveals terrible law-of-nature like fights that animals endure on a smaller, maybe invisible scale, portraying nature in a darker light than was shown at the beginning at the man's scale.