Just in case your don't know what to expect:

1. Urates...dry white substance, sometimes brown. Looks like popcorn from a distance

2. Poop - pretty clear what fecal matter looks like

3. fecal matter that has hair and bone fragments (they don't digest this) I guess

4. Urine - which can have a very strong odor depending on your substrate and absorption.

Still, super manageable.