[aidenn0]

I thought there were some convincing arguments that dark matter couldn't be fermions, but that's a vague memory.

[Edit] I think it was actually baryons which are composites of an odd number of fermions if my memory of college physics is right

[jleahy]

Yes it's baryons. There is some missing baryonic matter (probably dust), but the bulk of it is something else (black holes, WIMPs, etc).