• Dolphins used to live on land before adapting to the water. When scientists studied their fins, they found out that they are actually formed like legs and toes
• Considering that dolphins now live in the sea and us humans on land, it is interesting to know that just a tablespoon of water in a dolphin’s lung could drown it, while a human would drown after two tablespoons
• Breathing is not an automatic response for dolphins like it is for humans; they must tell themselves when to breathe, just like your blond ex-girlfriend
• While sleeping, a dolphin must stay at the surface so its blowhole is not covered with water and it only switches off one side of its brain to keep breathing and staying alert
• Dolphins give themselves names; they develop their own individual whistles as names. Mariiiiiiiiiiiiiiiiiiiia…
• If you killed a dolphin during the time of Ancient Greece it was punishable by death, because to the Greeks, dolphins were sacred fish
• Dolphins are carnivores and an average dolphin eats about 30 pounds of fish a day
• Dolphin sonar is superior to bats sonar and man-made sonar
• Dolphins have few natural enemies, and we are their main threat
• They are as smart as apes
• They might be even smarter than you flatmate

Oh, they were 11 dolphin facts, I apologise.