- The green color is due to blue pigment in the skin covered by a thin layer of yellow mucus. Many color variations are known, including white, bright yellow, bright blue, and black and white.
- The largest North American frog.
- Breeds from about March through July or August.
- Tadpoles take 6 months to 2 years to mature.
Their status is stable, but like other amphibians they suffer from habitat destruction and pollution.