>>15992064They may be like the Grays in Deus Ex. They have the capability built in to make use of a very complex language and share thoughts and ideas, but, since their life is nothing more than just 90 days of hiding under a bush and making noise, how would they have anything to really talk about? Your brain can't dream if you've never had any experience in the real world.
So, sure, it's very well possible that they have their own array of communication, but that doesn't mean it's put into any use. What if they're just babbling gibberish to each other? Imagine a room full of people just saying random stuff. They might simply be making noise because it's all they know to do, or, like you said, warning of predators. Although, I don't know if that works well. I mean, sure, maybe the predators aren't understanding what they're saying, but, the crickets are still making a lot of noise, which makes it easy for anybody to locate them. No? For example, birds have excellent hearing. They would be able to find a cricket and kill it, if it just kept making noise for long enough. So what advantage does their warning capability give them? It does more harm than good by not letting the crickets stay discreet with their position. They might be warning the others of a predator nearby, but that just makes it worse on them. It might be like a sacrifice thing? One cricket makes a lot of noise in order to draw the predator so the others know to stay away? Hell, maybe that's why they only make noise during the nighttime, because the vision impairment makes it harder on anybody trying to find them, while in the daytime, it would be pretty easy to spot them from the noise and clear illumination combined. During the night, unless the predator has night-vision or something, they only have the noise to go off by. Character limit.