Among all the existing aquatic mammals, the best known and most admired is surely the dolphin. Now you can see this animal on this page. There is a collection of dolphin coloring pictures to print here.
Dolphins are mammals whose able to stay underwater without breathing for only a few minutes, and the most abundant species that belongs to the same family of these specimens is the Orca.
Dolphin Coloring Pages To Print
The dolphin has a length of about 200-250 cm, its average weight is around 70-130 kg, and its lifespan ranges from 25 to 30 years.
To be able to swim quickly, the dolphin, like any other cetacean, is endowed with a decidedly hydrodynamic body, the skin.
Dolphin Coloring Pages
On the contrary, the skin is very smooth and hairless, and this allows it to overcome the resistance of the water through the secretion of oil or mucus.
Precisely for this reason, inside the skin, there are unique skin crests that allow the dolphin to hinder the creation of vortices.
In contrast, the production of specific oily secretions will enable it to both cancel the turbulence present inside the water and to slide very quickly on the surface.
The dolphin can swim for many days, reaching a speed of 18-20 km/h. This is not its maximum speed because it can sail much faster, reaching a maximum of 45 km/h.
Furthermore, as it does not need to support the body, the skeleton has a fragile structure. The cervical vertebrae are very short and to render the neck secure, thus avoiding that it can bend during the swim, making it complicated.
They are frequently fused, while the forelimbs are formed by two natatoia, which are decidedly well developed. The hind limbs, on the contrary, have only some residuals of pelvic bone formed by two small bones that are placed behind the muscles.