They could trade the information.
I am not suggesting a specific mechanism here, rather objecting against the generalization that alien species will have no way to pass knowledge to the next generation unless they do it like we do. There can be other ways.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.