The animal known for its distinctive, loud call and vibrant colors in the rainforest is the poison dart frog. These small amphibians, primarily found in Central and South America, are notable for their bright coloration, which serves as a warning to predators about their toxicity. Their calls, which can be sharp and resonant, are used to communicate with one another, especially during mating rituals. Different species exhibit unique patterns and colors, making them particularly fascinating to researchers and nature enthusiasts alike. Conservation efforts are crucial to protect their habitats from deforestation and climate change.