Structural adaptations of dolphins are:
they are fast
It spits out water when it eats.
The dolphin has some important adaptations. A dolphin has live births so it doesn't have to stay with eggs, it has lungs but can also swim for a while underwater.
certain dolphins such as the Atlantic Spotted Dolphin can send vibrations that will bounce off of anything in the way of the path of the dolphin and send it back so the dolphin will know what it is if it sees it again the dolphin will know if it is a predator or a victim.
they have special adaptations to their habitat. In fact, river dolphins are only distantly related to sea dolphins.
It is difficult to estimate population of the blue dolphin since there are many different species that span large geographic areas. The blue dolphin mainly live in shallow areas.
The Pacific whitesided dolphin's biggest winter adaptation is that it migrates to California during this time.
The maximum population is 3,000 to 4,000 by eden
3452
about 6,107
There long nose helps them kill sharks and whale and predators
The Chinese River Dolphin