Wear clothes
Write about history no one currently alive has seen
Make music
Go to space
Theorize
Write about history no one currently alive has seen
Make music
Go to space
Theorize
Make music - I know that birds sing, and a quick Google search shows whales and seals seem to make "music" as well
Theorize - Depending on what you mean of course (but I agree with you about e.g. scientific hypotheses to be tested), but as an example apparently birds "theorize about the minds of others", again by Google search
Writing - Definitely a stretch here (and so I agree with you) but animals do leave chemical markings for others
You show me one outfit, I raise you an entire textile, clothing, and fashion industry allowing us to show our features in displays of status all the way to enabling us to walk in space.
Compose music
Laika does not approve of this message :)
> Theorize - I always thought cats who look at a gap for a while before jumping are theorizing if/how to make the jump.
Not sure about those.