Discover hundreds of never-before-seen resources! Create your free account at https://my.happylearning.tv/ and start learning in the most entertaining way. What are you waiting for? The dolphin, a very friendly mammal Hello friends, and welcome to a new Happy Learning video. Today we are going to learn about one of the most friendly and fun mammals, presenting the dolphin. Dolphins are aquatic mammals which live in most seas around the world. Dolphins have a dorsal fin on the top part of their body and two lateral fins as well as a flat tail called a fluke, which they use to beat the water in an up and down motion, allowing them to swim at great speeds as well as completing agile jumps out of the water. Did you know that dolphins don't have a nose? They have a beak and they breathe through a hole above their head. Can you see it? well this hole is called the blow hole and they close it every time they go under water so as not to let water come into their lungs. Dolphins can subm