| 1. Dolphins are mammals;they nurse their young from | | | | which can grow to 2.5-2.8 meters. |
| mammary glands. | | | | 9. Dolphins are warm-blooded and their internal |
| 2. Dolphins can swim up to 260 m. below the surface | | | | temperature is around 36 degrees. To conserve this |
| of the ocean, although they are mainly shallow divers. | | | | temperature they are surrounded by a thick layer of |
| 3. Dolphins can stay up to 15 minutes under water | | | | fat called "blubber" just below the skin. |
| although they usually stay only a few minutes diving. | | | | 10. The average botllenose dolphin brain weighs |
| 4. Dolphins use a technique called echolocation to find | | | | 1500-1600 grams, while average human brain weighs |
| food and navigate. | | | | 1200-1300 grs. This is not a conclusive evidence of |
| 5. Dolphins are social beings which live in groups and | | | | dolphin intelligence as many other factors might be the |
| cooperate among each other for activities like getting | | | | cause of intelligence according to scientists. 11. Dolphins |
| food and calf rising. | | | | can make a unique signature whistle that may help |
| 6. There are 32 species of ocean dolphins and 5 | | | | individual dolphins recognize each other or perform any |
| species of river dolphins. 7. The largest dolphin is the | | | | other kind of communication still unknown. |
| "killer whale" (orca), which can grow to 6.1 meters long. | | | | 12. Bottlenose dolphins can swim 5 to 12 kilometers per |
| 8. The most known dolphin is the "bottlenose dolphin" | | | | hour, although they can reach up to 32 km/h. |