There’s a common critique in science fiction series like Star Trek about the extraterrestrial species not looking ‘alien’ enough, as well as about their technology being strangely…
That not about difference in intelligence it's about difference is size...
And Humans would 100% notice a spaceship with being 1,000s of times bigger than us, if only because it would block the sky and change gravity.
If aliens were the size of ants, they likely won't have the space for a brain big enough to get here.
Aliens might be real somewhere, but the universe is too huge to travel. Unless they're functionally immortal, there's no chance we see a live one.
If (and it's a big if) we see proof of extraterrestrial life, it's going to probes/drones/robots from a civilization that existed long before intelligent life on Earth started. Even if they are still around, they probably won't be by the time they get some kind of response.
The best chance is coming across some ancient version of the Voyager prove. Just enough that it proves we're not alone, but not enough to actually do anything about it
Unless they’re functionally immortal, there’s no chance we see a live one.
That's not that much of a stretch, though. The way things are going, we'll probably have indefinite lifespans before we have major colonies on other planets.
That's as likely as saying Santa and the Easter Bunny are real, but magically make everyone forget once they stop being kids and implant false memories in the adults who think they bought the presents or hid the eggs themselves
What’s more likely is the Dark Forest phenomenon as laid out in the Three Body Problem. Basically, it’s an existential threat to be seen by extraterrestrial life, so it’s best to keep quiet.
When I see people make comparisons like this, I often think of a paragraph from Mark Twain's, "The mysterious stranger". It's where Satan compares the intellect of an angel to that of humans.
“Well, it is true that they are nothing to me. It is not possible that they should be. The difference between them and me is abysmal, immeasurable. They have no intellect.”
“No intellect?”
“Nothing that resembles it. At a future time I will examine what man calls his mind and give you the details of that chaos, then you will see and understand. Men have nothing in common with me—there is no point of contact; they have foolish little feelings and foolish little vanities and impertinences and ambitions; their foolish little life is but a laugh, a sigh, and extinction; and they have no sense. Only the Moral Sense. I will show you what I mean. Here is a red spider, not so big as a pin's head. Can you imagine an elephant being interested in him—caring whether he is happy or isn't, or whether he is wealthy or poor, or whether his sweetheart returns his love or not, or whether his mother is sick or well, or whether he is looked up to in society or not, or whether his enemies will smite him or his friends desert him, or whether his hopes will suffer blight or his political ambitions fail, or whether he shall die in the bosom of his family or neglected and despised in a foreign land? These things can never be important to the elephant; they are nothing to him; he cannot shrink his sympathies to the microscopic size of them. Man is to me as the red spider is to the elephant. The elephant has nothing against the spider—he cannot get down to that remote level; I have nothing against man. The elephant is indifferent; I am indifferent. The elephant would not take the trouble to do the spider an ill turn; if he took the notion he might do him a good turn, if it came in his way and cost nothing. I have done men good service, but no ill turns.
“The elephant lives a century, the red spider a day; in power, intellect, and dignity the one creature is separated from the other by a distance which is simply astronomical. Yet in these, as in all qualities, man is immeasurably further below me than is the wee spider below the elephant."
In a way his analogy breaks down since he, a human, is spending actually quite a bit of time thinking on the life of this spider. As we do many creatures