"I am the largest animal that has ever lived on Earth — larger than any dinosaur. I breathe air but I live in the sea. I sing songs that travel hundreds of miles. What am I?"

Answer: A Blue Whale. The blue whale is the largest known animal in Earth's history, reaching up to 30 metres in length and 200 tonnes. Despite living in the ocean, it breathes air. Male blue whales produce vocalisations that can be heard by other whales hundreds of miles away.