Among the adaptations of dolphins are hydrodynamic bodies, blowholes on top of their heads, flippers and flukes and echolocation. Some scientists believe that dolphins are able to enjoy the benefits of sleep even while they're in the water by having one half of their brains alert and the other shut down.Continue Reading
As with other whales, the ancestors of dolphins were terrestrial animals that returned to the sea for good. They are entirely pelagic, but they are still mammals. This means they are warm-blooded, need to breathe air and nurse their young with milk from mammary organs.
To help the animals move through the water, their bodies became streamlined. Their forelimbs evolved into flippers and their tails evolved into flukes. They lost their hind limbs.
The unique shape of a dolphin's pupils allow it to see well in both air and water.
The dolphin's nostrils moved up to the top of its head and became blowholes. This allows it to breathe without raising its head out of the water.
Dolphin babies are born flukes first and need help to the surface for their first breath. They don't have lips to suckle milk from their mothers, so the milk is injected into their mouths.Learn more about Marine Life
Frogs look like tailless, hairless animals with long hind legs, bulging eyes located near the top of their heads, and short, stocky bodies. Toads are actually a subgroup of frogs, adapted for life on dry land.Full Answer >
Evolutionary biologists believe that dolphins emerged 20 to 25 million years ago during the early Miocene period. Modern species may trace to kentriodontids, which are small-toothed whales believed to have the echolocating ability as modern dolphins do.Full Answer >
Some dolphins migrate seasonally to warmer water, but other dolphin pods will remain within a home base without migrating. Scientists differentiate between coastal dolphins and off-shore dolphins. Coastal dolphins are more likely to migrate than off-shore dolphins, which scientists attribute to the coastal dolphin's smaller body needing warmer waters.Full Answer >
The 42 known species of dolphins live in the waters of oceans and rivers all over the world. Dolphins are found everywhere, from shallow coastal waters to the deep of the open ocean, and they migrate to and from certain areas due to water temperature and food availability.Full Answer >