[CaptainMarvel]

Wear clothes - I know that hermit crabs wear shells

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

[andsoitis]

> Wear clothes - I know that hermit crabs wear shells

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.

[wizzwizz4]

Sounds like industry is the unique part, then, not clothing.

[burnished]

So a difference in degree then, not kind

[dwighttk]

Wear items of clothing that aren’t scavenged detritus

Compose music