Pink Dolphins – the Friendliest Mammals Known

Pink Dolphins – the Friendliest Mammals Known
Pink dolphins are much different from the dolphins you usually see when you are into the sea or ocean. You can also tell that they are adapted to their environment and they are very distantly in relation to the ones you see in the ocean.

There are five species of the river dolphins known till date and among them, the Amazon pink dolphins are referred to as the most intelligent among all. It has also been stated that the brain capacity of these species are 50% greater when compared with that of the humans.

Apart from the Amazon River, the pink dolphins can be a common sight along the upper Madeira River and also the Orinoco basins. As the name suggests, pink dolphins are mostly seen in pink colour even though other colour variations are also very well known including brown, light gray or even light pink.

It is simply amazing and yet shocking the among the five river dolphins known, except this variety the other four species are nearing extinction or can be said as they are extinct. On the other hand, these dolphins, pink in colour are known to constitute the greatest population among their own class.

Yet another surprising fact is that pink river dolphins are the most endangered species among the cetaceans known in the world. IUCN or the International Union for the Conservation of Nature listed them among the “vulnerable species-threatened” category. It was only recently they altered their section to another category, “endangered species-threatened”. This is an awful situation as we you can never find such friendly creatures anywhere else and they are facing extinction and we are just helpless other than to just sit and watch!

The reason for pink dolphins extinction is still on and the finding states that the destruction of Amazon basin has resulted in the demolition of its habitat thus leading to their extinction. Use of mercury in the gold mining process has also resulted in the death of a huge number of dolphins as the level of contaminants in mercury is too high for these social creatures to tolerate.

Yet another reason pointed out was the immense traffic in the Amazon basin. With such crowd, noise and disturbance of the nature’s balance makes them move here and there. Thus they get hit by sharp propellers or vessels leading to their death. Some other reasons include sound pollution; destruction of pink dolphins habitat and even the destruction of their progeny are some of the greatest faults from our side!
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The Pink Dolphins are from Delphinidae Family

The Pink Dolphins are from Delphinidae Family
The Delphinidae family, is made up of dolphins that people commonly know more about. These include include:

• Common Dolphin
• Risso's Dolphins
• Bottlenose Dolphin
• White-Sided Dolphin
• White Beaked Dolphin
• Dusky Dolphin
• Falkland Island Dolphin
• Hour Glass Dolphin
• Peale's Dolphin
• Sarawak Dolphin
• Pygmy Killer Whales
• Heaviside's Dolphin
• White Bellied Dolphins
• Orcas - also known as Killer Whales
• False Killer Whales
• Irrawaddy River Dolphins
• Pilot Whales
• Short-finned Pilot Whales
• Broad Beaked Dolphins
• Southern Right Whale Dolphins
• Northern Right Whale Dolphins

The last family in the Odonticeti sub-order is the Phocoenidae family, which is made up of the various species of porpoises. This includes the Harbor Porpoise, Spectacled Porpoise, Black Porpoise, Black Finless Porpoise, Dall's Porpoise, True's Porpoise, Finless Porpoise, and Cochito Porpoise.

The final sub-order of cetaceans is the Archaeoceti family. This is the family of whale's that no longer exists. They are fossil whales, as they existed before dolphin's began to evolve, and they date back 50 million years.
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Pink Dolphins are Cetaceans

Pink Dolphins are Cetaceans

All Pink dolphins belong to the cetacean family. The Cetacean order is broken down into sub-orders. In other words, the entire cetacean family is broken down into smaller families.

The first sub-order is the Mysticeti family, which is made up of Baleen Whales. These whales capture prey by straining water through a series of baleen plates in their mouths. Included in the Mysticeti family is the Balaenopteridae family, which is made up of Minke Whales, Sei Whales, Bryde's Whales, Blue Whales, Fin Whales, and the Humpback Whales. The next family of cetaceans in the Mysticeti group is the Balaenidae family. The Bowhead Whales, Northern Right Whales, Southern Right Whales, and Pygmy Right Whales make up this group, and they are characterized by their habit of being slow-moving, continuous filter feeders. Still in the Mysteiceti group, the next family is the Eschrichtidae family. This family is comprised of the Gray Whale.

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What do pink dolphins eat?

What do pink dolphins eat?

Like all dolphins, the pink Amazon river dolphin, which is the largest of the world’s four freshwater dolphin species, eats fish. Even though food is plentiful in the waters of the Amazon and Orinoco river drainages, the pink dolphin, or “boto,” as it is called by natives, is not a picky eater. Around 50 species of small freshwater fishes are on its menu, and it often hunts for them by poking its long, slightly curved beak among the branches of the sunken trees that litter the river bottoms.

But the question “how do pink dolphins eat?” is at least as interesting as “what do pink dolphins eat?” because their amazing beaks, which are full of extraordinarily sharp teeth, help them in many ways.

All dolphins find food by using echolocation, or sonar, and echolocation is especially important to botos on the hunt because visibility is extremely poor in their murky river habitats. A pink dolphin locates a fish by sending out high-frequency sound pulses from the top of its head. When these sound waves reach the fish, they are deflected back to the dolphin, who senses them through the long jawbone in its extremely long beak–the jawbone acts almost like an antenna. The dolphin then moves in to grab the fish.

Most of the fish in the pink dolphin’s diet are very bony compared to ocean fish. Many have tough, almost “armored,” outer bodies, and some even protect themselves with sharp, hard spines. But these defenses are no match for the pink dolphin’s powerful jaw and “armor-piercing” teeth. The teeth at the front of the boto’s beak are designed for puncturing and holding even the toughest of catfish; the teeth at the back of the beak form a superb and merciless crushing tool.

Once a fish is caught and crushed, the boto, as all dolphins do with their food, swallows it without chewing. Later, it may regurgitate bones spines and other indigestible parts.

So the correct answer to the question, “what do pink dolphins eat?” is, almost anything small that swims.
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10 Facts About Dolphins

10 Facts About Dolphins
Pink Dolphins

Dolphins are well known for their intellect, their gregarious nature, and their acrobatic abilities. But there are many lesser known qualities that make a dolphin a dolphin. Here we'll explore ten characteristics of dolphins and learn more about these much-loved marine mammals.

1. Dolphins belong to a group of mammals referred to as cetaceans (or Cetacea). The cetaceans are further broken down into two main groups, the toothed whales (or Ondontoceti) and the baleen whales (Mysticeti). Dolphins are classified as toothed whales (Ondontoceti). Other toothed whales include killer whales, pilot whales, beluga, narwhal, sperm whales, and several groups of river dolphins.

2. The term 'dolphin' refers to a diverse assortment of marine mammals. The term dolphin is not restricted to a single taxonomic class and therefore is an unspecific term. The groups of toothed whales whose members are often referred to as dolphins include the oceanic dolphins (Delphinidae), river dolphins (Iniidae), and the Indian river dolphins (Platanistidae). Of these groups the oceanic dolphins are by far the most diverse.

3. Oceanic dolphins are also referred to as 'true dolphins' and are the most diverse group of cetaceans. The species of dolphins that belong to the Family Delphinidae are referred to as 'oceanic' or 'true' dolphins. The Delphinidae group includes about 32 species and is the largest of all subgroups of the cetaceans. Species of oceanic dolphins (Delphinidae) inhabit the open ocean, though this is not a strict rule for the group (in some cases, oceanic dolphins inhabit coastal waters or riverine habitats).

4. Some oceanic dolphins have a prominent beak also known as a 'rostrum'. The snout of some oceanic dolphins is long and slender due to their elongated, prominent jaw bones. Within the dolphins' elongated jaw bone sits numerous conical teeth (some species have as many as 130 teeth in each jaw). Species that have prominent beaks include, for example, Common Dolphin, Bottlenose Dolphin, Atlantic Humpbacked Dolphin, Tucuxi, Long-Snouted Spinner Dolphin, and numerous others.

5. A dolphin's forelimbs are known as 'pectoral flippers'. The forelimbs of a dolphin are anatomically equivalent to the forelimbs of other mammals (for example, they are analogous to arms in humans). But the bones within the forelimbs of dolphins have been shortened and made more rigid by supporting connective tissue. Pectoral flippers enable dolphins to steer and modulate their speed.

6. Some dolphin species lack a dorsal fin. The dorsal fin of a dolphin (located on the back of the dolphin) acts like a keel when the animal swims, giving the animal directional control and stability within the water. But not all dolphins have a dorsal fin. For example, the Northern Rightwhale Dolphins and the Southern Rightwhale Dolphins lack dorsal fins.

7. Dolphins have a unique sense of hearing. Dolphins do not have prominent external ear openings. Their ear openings are small slits (located behind their eyes) which do not connect to the middle ear. Instead, scientists suggest that sound is conducted to the inner and middle ear by fat-lobes located within the lower jaw and by various bones within the skull.

8. Dolphins have excellent vision in and out of the water. When light passes from air to water, it changes speed. The creates an optical effect referred to as refraction. For dolphins, this means their eyes must correct for these differences if they are to see clearly in both conditions. Fortunately, dolphins have specially adapted lens and cornea that enable them to see clearly in and out of the water.

9. The Baiji is a critically endangered river dolphin that inhabits the murky waters of the Yangtze River in China. The Baiji has suffered dramatic population declines over recent decades due to pollution and heavy industrial use of the Yangtze river. In 2006, a scientific expedition set out to locate any remaining Baiji but failed to find a single individual in the Yangtze. The species was declared functionally extinct.

10. Dolphins probably do not have a very strong olfactory sense. Dolphins, like all toothed whales, lack olfactory lobes and nerves. Because dolphins do not possess these anatomical features, they most likely have a poorly developed sense of smell.
Pink Dolphins
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PINK DOLPHINS ANCESTORS

PINK DOLPHINS ANCESTORS

Ancestors:
Ancestors of Inia geoffrensis were a relatively successful marine group, but were displaced during the Miocene period by the appearance of more advanced delphinids. Inia may have entered the Amazon from the Pacific Ocean approximately 15 million years ago, or from the Atlantic Ocean between 1.8 million and 5 million years ago. Their long beaks (often lined with tiny hairs), small eyes, disproportionately large flippers and highly flexible bodies -- once considered "primitive" features -- are now recognized as specialized adaptions to a complex environment.

Soltalia fluviatlis is a warm-water coastal species distributed from the eastern coast of Central America down along the northeastern coast of South America. No one knows for sure when some of these delphinids began to occupy and adapt to freshwater river systems. They are one of the few delphinid species which can move freely between fresh, brackish, and marine waters.
Pink Dolphins

Pink and Gray River Dolphins

Pink and Gray River Dolphins

Of the five freshwater species of dolphins in the world, the pink Amazon River dolphin, Inia geoffrensis, or "bufeo colorado” as they are known in Peru and “botos" as they known in in
Brazil, are considered to be the most intelligent.

These friendly, sensitive, pink dolphins with a brain capacity 40% larger than that of humans, who have lived in harmony with the people of the Amazon and its tributaries for centuries, now face
extinction in some tributaries. What was considered to be one of the least threatened species of dolphins 20 years ago, has now become one of the most endangered species due to the accelerated and commercialized rape of the Amazon basin and the destruction of the South American tropical rainforest.

No one knows the actual number of pink dolphins that live in the Amazon basin, but according to the reseach and studies that Roxanne Kremer has conducted in the Upper Basin of the Peruvian Rainforest, 150 kilometers upstream of Iquitos, Peru, the number of pink dolphins from 18 years ago has risen from eight pink dolphins on the Yarapa River to 35 to 45. Ms. Kremer counted the dolphins in July 1998. ISPTR believes that her work with the Peruvian Forest Police to protection both species of river dolphins, and empowering the local peoples of their rights and use of the law, there has been less illegal commercial fishing and logging in the area, thus saving the natural habitat of the land and aquatic life.

The struggle to save these pink dolphins as an important link in an ecosystem -- currently being encroached upon by industrialized forces -- is being spear-headed by the non-profit
International Society for the Preservation of the Tropical Rainforest (ISPTR), whose first globally known project PARD, the Preservation of the Amazonian River Dolphin.
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