Design in Dolphins

Dolphins and whales breathe using their lungs just like other mammals, which means they cannot breathe in the water like fish. This is why they regularly visit the surface. The blowhole which is situated on top of their heads work for air intake. This organ is designed in such a way that when the animal dives into water, the opening closes automatically with a special cap in order to prevent water from entering. The cap automatically opens again when the dolphin surfaces.

A System that Facilitates Sleep without Drowning

Dolphins fill 80-90% of their lungs with air every time they breathe. However, in many humans this ratio is about 15%. The breathing of dolphins is a conscious act and not a reflex as it is with other land mammals.54

The dolphin has been created with the body form that best fits its environment.

In other words, dolphins consciously decide to breathe as we make the choice to walk. There is a system created to prevent the death of the creature during its sleep under water. The sleeping dolphin uses the right and left hemispheres of its brain alternatively for periods of about fifteen minutes. While one hemisphere sleeps, the dolphin uses the other to surface for air.
The snout of dolphin's beak is another feature that improves their swimming. The animal uses less energy in cutting through the water and swimming at higher speeds. Modern ships, too, make use of a bow like the dolphin's snout, hydro-dynamically designed to increase the speed of ships just like dolphins.

Social Life of Dolphins

Dolphins live in very large groups. For protection, females and offspring are located in the centre of the group. The sick are not left alone but are kept in the group until they die. The ties of interdependence are formed from the first day a new offspring joins the group.
Dolphin calves are born tail first. This way the infant is provided with oxygen throughout delivery. When at last the head is released, the newly born dolphin rushes for the surface for the first gasp of air. Generally, during delivery another female accompanies the mother giving birth.
Mothers start to nurse their young immediately after birth. The new dolphin, lacking lips to suck, receives milk through two sources coming out of a slit on the mother's ventral surface. When it taps gently on this section, the milk is sprayed out. The young dolphin consumes dozens of quarts (litres) of milk every day. 50% of the milk is composed of fat (compared to 15% in cattle milk), which promptly works towards building the skin layer necessary to regulate body temperature. Other females also help the young dolphins during rapid dives, by pushing them down. Newly born dolphins are also taught how to hunt and use their echolocation sonar, which is an educational process continuing for years. In some cases, young dolphins may never leave a particular family member for up to thirty years.

The System Preventing the Bends

Dolphins can dive down to depths that cannot be matched by humans. The recordholder in this category is a species of whale that can dive down to 9900 feet (3000 metres) on a single breath. Both dolphins and whales are created appropriately for these kinds of dives. The tail flukes make diving and surfacing much easier.

Another aspect of the design for diving is in the lungs of these animals: as the animal descends the weight of the water column above, i.e. the pressure, increases. The pressure inside the lungs is increased to balance the outside pressure. If the same pressure were to be applied to human lungs, they would easily disintegrate. In order to overcome this danger, there is a special defensive system lodged in a dolphin's body: the bronchi and air cells (alveoli) inside the dolphin's lungs are protected by rings of cartilage that are extremely durable.
Another example of the perfection of creation in the bodies of dolphins is the system that prevents the bends. When divers ascend to the surface too quickly, they face this danger. The reason for the bends is the entrance of air directly into the blood and formation of air bubbles in the arteries. These air bubbles can cause death by preventing blood circulation. Whales and dolphins, however, do not face similar dangers, although they breathe using their lungs. This is because they dive with lungs not full of air but empty. Since there is no air in their lungs, they do not run the risk of getting bent.
Nevertheless, this leads to the real question: if they do not have any air in their lungs how do they not suffocate due to lack of oxygen?
The answer to this question lies with the "myoglobin" protein that is found in their muscle tissue in high proportions. The myoglobin proteins have a high affinity for oxygen, so the oxygen necessary for the creature is not stored in the lungs but directly in the muscles. Dolphins and whales can swim without breathing for extended periods, and can dive as deep as they like. Humans also have myoglobin protein, but it cannot sustain the same conditions due to its much smaller volume. This biochemical adjustment unique to dolphins and whales is, of course, evidence of deliberate design. Allah created sea mammals, like the rest of the animals, with body structures best fitted to the conditions in which they live.