- Dolphin is the most common and very well known aquatic animal.
- Unlike most fishes found in sea, dolphin are identified as the aquatic mammal under the order of Artiodactyla.
- Dolphins size can range from the smallest size of 1.7 meter long to the biggest size if about 9.5 meter long.
- Dolphins are found to leap outside the water very frequently, their leap can sometimes be of 30 feet approx.
- Some dolphins are said to travel at the speed of 29 kilometers per hour.
- Majority species of dolphins are said to prefer the warm water climate, however, some exceptional species of dolphins are also found in the cold water climate.
- The anatomy or the external features if the dolphin can be classified as the torpedo-shaped body, non-flexible neck, limbs modified into flippers, a tail fin and a bulbous head.
- Dolphins are found to have a layer of fat, under the skin to keep warm in cold conditions.
Why do dolphins have a blowhole?
- The way we have our nostrils, the nostrils of the dolphins are said as blow hole.
- Their prime function is to help in respiration.
- They are situated at the top of their head so that it can be easy for respiration.
- Dolphins are the aquatic mammals and have similar characteristics like us for respiration.
- Their lungs are also filled with air, and they do not consists of any gills for respiration through water.
- While swimming, the dolphin can get its part of oxygen from the air by just keeping its head on the surface of water.
- Once the intake of air is completed, this blowhole is tightly sealed by the muscles to prevent the entry of any water in it.
- When a blowhole is exposed to the surface above water, there is the release of air from the blowhole before raking up the new air for respiration.
- A dolphin is known to hold its breath for the average amount of time of 5-7 minutes.
- Unlike human being, dolphin has a separate tract for both the passage of food and for the intake of air. They cannot breathe like us from the mouth.
- Dolphins are found to have greater amount of blood in them as compared to the human beings. This increasing blood helps them to maintain higher oxygen level in them.
- Who are the predators of dolphin?
- What all are the prey of dolphin?
- Who are the ancestors of dolphin?
True or False:
- Dolphins are the aquatic mammals.
- Dolphins breathe through the gills.
- Dolphins have flexible neck.
- Dolphins are found to have layer of fat to control their body temperature.
- Dolphins have their lungs filled with water.
- Dolphins are the _______.
- Aquatic mammal.
- Land mammal.
- The smallest size of dolphin is found to be about ______.
- 1.7 meter.
- 1.4 meter.
- 1.3 meter.
- 1.6 meter.
- Dolphins can leap up to ______.
- Thirty feet.
- Twenty feet.
- Ten feet.
- Fifty feet.
- _______ is present above the head.
- _______ are modified into flippers in dolphin.