Dolphins are incredible marine mammals that are very smart, socially skilled, intelligent, agile and playful animals. Dolphins share many emotional similarities with humans, they even can feel happiness and joy. Dolphins breathe air so they need to surface to get to it. They also surface to give birth. Dolphins live in groups and their sons and daughters may stay with their family for life. Favorite dolphin food is fish, but they do not chew their food, but they break it into smaller pieces before swallowing. The largest of the dolphins are orca aka killer wale. An animal custom progress bar for YouTube with Dolphin.