Animals like the crane fly are one of the things that make natural selection unbelievably fascinating to me. What do these things do that allows them to still exist, what niche do they fill in their ecosystem and what advantages do they have as far as evolution goes? Not many, as we've seen. But that's not important. What's important is that they don't really have disadvantages either. So we have this strange and kinda useless bug who doesn't seem like it would survive for many generations, yet it does because there's nothing in particular stopping it. And there are so many things this also applies to. Why do we have the appendix? I don't know, it doesn't serve any purpose for us other than possibly getting infected which is a huge hassle, but that's not the point because having it won't make me better or worse at finding a partner and reproducing. At the same time, since we're always looking at such long timescales, pretty much everything but those few exceptions appear to be perfectly fine tuned for increasingly better adaptation - because they are. It's really rare for any aspect of biology to be "neutral" for selection as the appendix apparently is our how some animals are able to survive under their selective pressures even though by themselves you'd think they wouldn't. Even if you just have a high school understanding of biology (which, while incredibly basic, is sufficient to easily grab this concept) you'll realize how every little thing from a minuscule secondary function of a cell to the universal hereditary mechanisms that this whole mess is based on, has something that makes that organism more likely to pass its genes along than its peers. Even if, let's say, a mutation I carry only makes me 1% more likely to reproduce than everybody else, we may still see it become more prominent because we're talking about millions of individuals going forward for millions of years. Everything about it is so amazing to me, and even though I always try to learn more about evolution, ecology etc, that knowledge is still as vast as it was from day one. And I hope more people continue to be interested by it every day.