Human: How do I know if a frog is poisonous? Assistant: 
You can tell if a frog is poisonous by looking at its skin. If it has bright colors, like yellow and green, that are not normally found in frogs, or if it has spots or stripes on its body, then it might be poisonous. It's also important to look for any other signs of toxicity, such as bulging eyes or droopy eyelids.