Here are some factors that can affect the color:
* Diet: A diet high in leafy greens or other colorful vegetables can make urine appear darker.
* Hydration: Dehydrated rabbits may have darker, more concentrated urine.
* Health: Certain health conditions, such as urinary tract infections, can cause urine to appear cloudy, red, or brown.
If you notice a significant change in the color or odor of your rabbit's urine, it's essential to consult with a veterinarian.