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Learn About Dolphins

Dolphins are truly remarkable creatures.

They are socially adept, highly intelligent, agile, joyful, and playful beings, exhibiting many emotional traits similar to humans.

With an impressive diversity of species, each dolphin possesses its own unique identity and distinct characteristics!
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key characteristics
of dolphins

  • 1,2 – 9,5 м
    Size
    (from the smallest species, such as the Caspian porpoise or vaquita, to the orca, which is biologically classified within the dolphin family)
  • 20–60 years
    Lifespan
    (most species live 20–30 years, but bottlenose dolphins and orcas can live up to 50–60 years)
  • 40 to 5500 kg
    Weight
    (from the lightest species to the orca)
  • Up to 55 km/h
    Swimming speed
    (the maximum speed of bottlenose dolphins and other fast species can reach 50–55 km/h)
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100 Facts About Dolphins

A Scientifically Verified Encyclopedia
  1. Dolphins are mammals, not fish. They breathe with lungs, give birth to live young, and nurse them with milk.
  2. The ancestors of dolphins lived on land about 50 million years ago. They were small four-legged predators that inhabited the region of the ancient Tethys Ocean.
  3. The closest living land relative of the dolphin is the hippopotamus. Genetic studies have confirmed their common origin from even-toed ungulates.
  4. Pakicetus is a transitional form that lived in the territory of modern Pakistan about 50 million years ago. It had limbs for moving on land and traits that foreshadowed echolocation.
  5. Evolutionary adaptation to the aquatic environment took about 20 million years: the tail became powerful, the forelimbs turned into flippers, and the nostrils shifted to the top of the head, forming the blowhole.
  6. About 30 million years ago, cetaceans split into two branches: baleen whales, which filter plankton, and toothed whales, to which all dolphins belong, retaining teeth and developing echolocation.
  7. The dolphin family Delphinidae includes about 40 species, from the Māui dolphin (~1.2 m) to the killer whale, or orca (up to 9 m, weighing up to 6 tons). Biologically, the killer whale is the largest species of dolphin.
  8. Four dolphin species have adapted to life in fresh water: the Amazon river dolphin (“pink dolphin”), the Ganges river dolphin, the Indus river dolphin, and the Chinese river dolphin.
  9. The Amazon river dolphin has reduced vision because it lives in murky water, but it has highly developed echolocation that allows it to detect objects on the muddy bottom.
  10. Three species live in the Black Sea: the common bottlenose dolphin, the short-beaked common dolphin, and the harbor porpoise (Azov porpoise). All three are listed in the Red Data Book of the Russian Federation.
  11. Dolphins reach speeds of 40–45 km/h over short distances, which is 4–5 times faster than the best human swimmer.
  12. Dolphin skin has a unique microstructure: the outer layer can instantly adapt to water flow, damping turbulence and reducing hydrodynamic drag.
  13. A dolphin’s tail fin moves vertically, up and down, unlike the side-to-side movement of fish. This creates more efficient thrust through pressure waves.
  14. The pectoral fins act as rudders, providing exceptional maneuverability: a dolphin can turn almost in place.
  15. In the wild, dolphins leap out of the water to heights of up to 6 meters. Proposed functions include orientation, communication, parasite removal, and play behavior.
  16. Echolocation is carried out through a fatty organ in the forehead called the melon, which focuses ultrasonic clicks into a directed beam.
  17. The accuracy of echolocation allows dolphins to distinguish objects by material, structure, and internal composition. Research confirms that they can distinguish metal and plastic objects of the same size.
  18. Dolphins can dive to significant depths: bottlenose dolphins up to 300 m, and sperm whales, relatives of dolphins, more than 2000 m with breath-holding of up to 90 minutes.
  19. Dolphins practice unihemispheric sleep: one hemisphere of the brain rests while the other controls breathing and monitors the surroundings. This allows them to avoid sinking and remain vigilant.
  20. Newborn dolphin calves have significantly shorter sleep periods in the first weeks of life, which promotes rapid development and helps maintain contact with the mother.
  21. A dolphin’s skin is completely renewed about every 2 hours, 9 times faster than human skin. This prevents the buildup of algae and bacteria.
  22. The lifespan of a bottlenose dolphin in the wild is 40–50 years. Individual animals have been observed in the same areas for decades.
  23. The brain mass of an adult bottlenose dolphin is 1500–1700 g, slightly more than the human average of about 1400 g.
  24. Spindle neurons, also called von Economo neurons, have been found in dolphin brains. These were previously considered unique to humans and great apes and are associated with social cognition and empathy.
  25. Dolphins pass the mirror test for self-awareness: when a mark is placed on their body, they swim to a mirror and inspect the marked area, showing that they understand they are seeing themselves.
  26. Each dolphin has a unique “signature whistle,” formed in the first months of life and functioning as an individual name.
  27. Research has confirmed that dolphins recognize the signature whistles of relatives they have not contacted for more than 20 years, demonstrating long-term social memory.
  28. Dolphins are capable of basic numerical operations: they distinguish “more/less” quantities and use this information in decision-making, for example when choosing a school of fish.
  29. In experiments, dolphins have demonstrated planning ability: they collected several objects in the required order before performing a task, indicating anticipation of the result.
  30. Observational learning speed in dolphins is extremely high: they can imitate new actions after only 1–2 demonstrations.
  31. Louis Herman’s research showed that dolphins understand syntactic differences: the commands “bring the ball to the hoop” and “bring the hoop to the ball” are perceived as different in meaning.
  32. Dolphin communication is multimodal: it includes whistles, clicks, postures, and tactile signals. More than 1000 different signal patterns have been recorded, and their full decoding remains a task for future research.
  33. In experiments, dolphins successfully generated new behavioral patterns on request, demonstrating abstract thinking and an understanding of the concept of novelty.
  34. Dolphins show behavior interpreted as play and “mischief”: deliberately varying responses in experiments and observing the partner’s reaction.
  35. In 2013, India’s Ministry of Environment and Forests recommended in a policy document that dolphins be considered “non-human persons” for the purpose of banning dolphinariums. This is not formal legal personhood in the full sense.
  36. The acoustic repertoire of dolphins is extremely rich: they can generate complex combinations of sounds. However, the claim of “superiority over human language” remains hypothetical and has not been confirmed by linguistic analysis.
  37. Neurophysiologist John Lilly in the 1960s proposed the hypothesis of dolphins as a “parallel civilization.” Although his ideas were controversial, modern research confirms a high level of cognitive complexity in dolphins.
  38. Cases have been recorded in which dolphins supported injured or sick relatives at the water’s surface so they could breathe, including individuals from other groups. This behavior is interpreted as empathy.
  39. Dolphins live in groups called pods, ranging from a few individuals to super-pods of 10,000 animals, for example common dolphins in the open ocean.
  40. In many species, males form stable coalitions of 2–3 individuals for cooperative territory defense and access to females. These alliances can last for decades.
  41. In Shark Bay, Australia, bottlenose dolphins pass from generation to generation the skill of using marine sponges as tools to protect the snout while foraging on the rocky bottom. This is an example of cultural tradition in a non-human species.
  42. Mothers teach calves hunting techniques, navigation, and social norms. The period of dependency lasts 6–7 years in some species.
  43. In killer whales, close relatives of dolphins, older females that have stopped reproducing play a key role in passing on knowledge about migration routes and food sources. This is analogous to the “grandmother effect” in humans.
  44. Dolphins form stable friendships: pairs of bottlenose dolphins have been recorded maintaining contact for more than 20 years, with joint hunting, resting, and mutual support.
  45. Females have been observed keeping the bodies of dead calves at the surface for several days, behavior interpreted as an expression of grief.
  46. During birth, other females in the pod often assist: they support the newborn, help it surface for its first breath, and protect it from potential threats.
  47. Dolphin calves are born tail-first to avoid drowning during birth. The first independent breath is critically important in the first seconds of life.
  48. Dolphin milk contains 30–50% fat, which is 5–10 times fattier than cow’s milk. This ensures rapid growth: a calf can double its weight in a few weeks.
  49. Play is observed not only in young dolphins but also in adults: wave riding, object manipulation, and acrobatic leaps are behaviors not directly linked to survival.
  50. Dolphins engage in sexual behavior not only for reproductive purposes but also to strengthen social bonds, reduce group tension, and form alliances.
  51. In Shark Bay, males that use sponges for hunting prefer to interact with each other, forming social circles based on shared skills, similar to interest-based clubs.
  52. Mothers and other pod members “answer” a calf’s signature whistle, reinforcing its individual signal. This ritual is functionally analogous to naming in humans.
  53. Dolphins use complex cooperative tactics, such as the “bubble curtain,” in which a group surrounds a school of fish and exhales air to create a cylindrical wall of bubbles.
  54. In Laguna, Brazil, bottlenose dolphins have cooperated with fishermen for more than 140 years: they drive mullet toward the shore and signal when to cast nets. This is a stable interspecies tradition.
  55. Similar cooperation has been recorded in Myanmar on the Irrawaddy River, in Mauritania, and in Madagascar. These are examples of convergent development of cooperative behavior in different regions of the world.
  56. In the fjords of New Zealand, dolphins have adapted their communication to the acoustics of rock walls: they pause after signals, waiting for the echo to fade before the next maneuver.
  57. Joint hunting by dolphins and seabirds, such as gannets, has been observed: dolphins drive fish to the surface, and birds attack from above. This is a mutually beneficial interspecies alliance.
  58. Tool use: in Shark Bay, bottlenose dolphins place marine sponges on the rostrum for protection when searching for food among sharp rocks. The skill is transmitted through the maternal line and is a local cultural tradition.
  59. “Strand feeding”: in South Carolina and Namibia, bottlenose dolphins drive fish into shallow water and partially beach themselves to catch prey. This is a complex skill that requires precise calculation.
  60. Dolphins use three-dimensional space when hunting: they drive prey toward rocks, the water surface, or the shore, using the bottom relief as a tactical element.
  61. Echolocation allows hunting in complete darkness and at depth: dolphins “see” with sound, receiving information about the shape, size, density, and movement of objects.
  62. Some dolphins can stun prey with a focused ultrasonic pulse, disorienting the school before capture.
  63. The echolocation clicks of certain species reach 220 dB, one of the loudest sounds produced by living organisms. For comparison, a jet engine is about 140 dB.
  64. Cases have been documented in which dolphins protected humans from sharks. In 2004, off the coast of New Zealand, a group of dolphins surrounded swimmers and prevented them from swimming away until a great white shark passed.
  65. The dolphin Pelorus Jack, from 1888 to 1912, escorted ships through Cook Strait in New Zealand for more than 24 years and received official protection under a special law after an attempt to attack him.
  66. Ancient sources, including Pliny the Elder, describe cooperation between dolphins and fishermen in the ancient city of Hippo. This is a historical precedent analogous to modern practices in Brazil.
  67. Cases have been recorded of dolphins supporting drowning people. The mechanism of this behavior is not fully understood: it is possible that the instinct to help relatives is triggered.
  68. Dolphins may detect the presence of sharks earlier than humans because of their sensitivity to chemical and acoustic signals. However, comparative studies with technical means require further research.
  69. Dolphin-assisted therapy is used with children with autism spectrum disorder, cerebral palsy, and post-traumatic disorders. However, systematic reviews have not found convincing scientific evidence of its specific effectiveness beyond the general positive effects of the aquatic environment and interaction with animals.
  70. The motivation of dolphins to help humans remains a subject of scientific debate: instinctive, social, and cognitive components are all possible.
  71. The U.S. Navy Marine Mammal Program was launched in 1960 in California. Dolphins were trained to deliver cargo, detect objects, and locate divers.
  72. The USSR created a similar center in Sevastopol in 1965. The program was classified, and up to 50 bottlenose dolphins were kept.
  73. During the Vietnam War in the 1970s, U.S. Navy dolphins patrolled the waters of Cam Ranh base, helping to detect underwater saboteurs.
  74. In 2003 in Iraq, more than 50 trained dolphins took part in clearing port waters of mines, using echolocation to detect mines in murky water.
  75. According to open data, the U.S. Navy currently keeps about 85 bottlenose dolphins to protect strategic facilities. The program’s budget in 2007 was $14 million.
  76. Dolphin echolocation surpasses technical sonar in detecting small objects, such as mines, in conditions of low visibility and complex acoustic environments.
  77. After the collapse of the USSR, the Sevastopol dolphinarium came under the jurisdiction of Ukraine. In the 2000s, reports appeared about the possible transfer of animals to third countries, but no official confirmation exists.
  78. In 2012, Russia announced the resumption of a dolphin training program in Sevastopol. According to analysts, the animals are used to detect underwater objects and saboteurs.
  79. No state officially confirms training dolphins to harm humans. The U.S. Navy publicly states that its program is purely defensive and search-oriented.
  80. The story of “armed dolphins” that escaped during Hurricane Katrina in 2005 has no documentary confirmation and is considered an urban legend. The U.S. Navy denied these reports.
  81. Dolphins exhibit intraspecific aggression: males compete for status and access to females. Scars from the teeth of conspecifics are often observed on the bodies of wild individuals.
  82. In Shark Bay bottlenose dolphins, cases have been recorded in which male coalitions hold females against their will for extended periods. This behavior has been described as “coalitional coercion.”
  83. Dolphins regularly attack harbor porpoises, not for food, in the waters of Scotland, Portugal, and California. Possible causes include training behavior, removal of competitors, or interspecies aggression.
  84. Cases of infanticide have been recorded: males kill the calves of other males to accelerate the female’s return to a reproductive state. This strategy is known in a number of mammals.
  85. Wild dolphins can pose a danger to humans: injuries to swimmers have been documented, especially during the mating season or when interfering with hunting.
  86. The dolphin Fungie, in Ireland from 1983 to 2020, was known for friendliness toward people, but episodes of aggressive behavior were also recorded. His disappearance in 2020 remains unsolved.
  87. No fatal attack by killer whales on humans has been recorded in the wild. Incidents in captivity are linked to stress factors, space restriction, and disruption of social behavior.
  88. The social structure of dolphins is hierarchical: dominant individuals have priority access to resources. Equality within the pod is absent, which is typical of many highly social species.
  89. Bycatch in fishing nets is one of the main threats: tens of thousands of dolphins die each year after becoming entangled in nets and being unable to surface to breathe.
  90. In the Japanese town of Taiji, an annual dolphin hunt takes place: some animals are killed for consumption, and some are sold to dolphinariums. The practice draws international criticism.
  91. In the Faroe Islands, the tradition of “grindadráp,” a mass hunt of pilot whales, which are large dolphins, continues. The event is regulated by local law but is contested by conservation organizations.
  92. As top predators, dolphins accumulate toxins such as mercury, PCBs, and plastics in fatty tissue. Pollution levels in stranded individuals often exceed safe thresholds.
  93. Anthropogenic underwater noise from shipping, seismic surveys, and military sonar disorients dolphin echolocation, leading to mass strandings and disruption of feeding behavior.
  94. The lifespan of dolphins in captivity, according to some data, may be lower than in the wild, by an estimated 30–50%, due to chronic stress, limited space, and disruption of natural social bonds.
  95. Full bans on keeping dolphins in captivity are in force in India, Hungary, Costa Rica, and Chile. In other countries, regulation varies from licensing to a lack of restrictions.
  96. The Chinese river dolphin, or baiji, was declared functionally extinct in 2006. It was the first dolphin species to disappear as a result of human activity, including pollution, shipping, and poaching.
  97. The international project CETI, the Cetacean Translation Initiative, uses artificial intelligence to analyze dolphin communication. In 2024, the first results were published: algorithms identified repeated patterns in whistles that correlate with specific contexts.
  98. Decoding the language of dolphins could become one of the most significant scientific achievements, enabling first contact with an intelligence that evolved independently of the human one.
  99. In a number of countries and international organizations, granting dolphins the status of “non-human person” with corresponding legal guarantees is being discussed. This is still at the stage of conceptual discussions.
  100. The ocean remains one of the least studied environments on the planet. Dolphins, having lived alongside humans for 50 million years, continue to reveal new facets of biological complexity, reminding us of the need for respectful and science-based interaction with nature.
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Dolphin Species

Systematics: Currently, there are approximately 49 known species of dolphins and porpoises, classified into several families.

This number may vary due to ongoing taxonomic revisions and the discovery of new species, as the classification remains a subject of scientific debate and refinement.

This section provides a complete systematic classification of all species described to date, including their Latin names.


Special attention is also given to the distribution of species across families and their biogeography.

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DELPHINES:
Comprehensive Review

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EDUCATIONAL PROGRAMS

Dear ocean lovers, researchers, educators, and nature advocates,

We are shaping the future of marine education.

Our Educational Programs section is your beacon into the world of dolphins — designed to support independent learning, deepen understanding of the ocean, and connect you with a global community dedicated to marine conservation.

YOUR BEACON INTO THE WORLD OF DOLPHINS

A CALL TO ACTION

This guide is not just a text — it is an invitation to action.

By studying dolphins, you contribute to the global protection of oceans and help shape a culture of responsibility toward our living planet.
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DOWNLOAD THE COMPLETE EDUCATIONAL PROGRAM GUIDE — DOLPHIN HUB

One document. All age levels. Academic structure.
This document presents the full Dolphin Hub Curriculum:
  • Designed for independent learners, educators, researchers, and partners
  • FOUR AGE-BASED PROGRAMS, EACH DESIGNED FOR ONE ACADEMIC YEAR 
  • Includes methodology, learning objectives, modules, lesson structures, and progress assessment systems
For educators and organizations:
This document may also serve as a foundation for in-person or hybrid educational programs, provided all activities comply with applicable local laws and regulations.

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