In ecology, there is a concept called the Red Queen Hypothesis. (It is named, whimsically, for the character from "Through the Looking Glass" who had to "run constantly to stay in place"). In a nutshell, it suggests that birds and mammals must change up their immune systems every generation (hence, use sexual rather than asexual reproduction) lest viruses and other parasites "beat" them in an evolutionary arms race.

So naturally, when I saw this photo, that was the first thing that came to mind:


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(Yes, I captioned that. I am probably one of very few people on this Earth who would think that first - well, after thinking, "How does she see in that" and "what the heck?")