Though there are still no known studies that prove that black cohosh can cause liver damage, you might as well take note of any signs such as jaundice, abdominal pain, fatigue, and darker color of the urine. (nutritional-supplements-health-guide.com)
Other reasons for abnormal color of the urine include muscle damage, diet, and concentration of the urine i.e. very dilute urine is clear where as very concentrated urine is dark yellow to orange in color. (safarivet.com)
Diseases of Domestic Rabbits (1988) by Lieve Okerman says «red color of the urine is sometimes observed in rabbits. (houserabbitga.com)