Top 8 Scientific Questions About Dolphins and Their Answers for Kids

Tell Your Child: Dolphins inhabit a wide range of environments. Some live in oceans, others in seas, and there are even freshwater dolphins that reside in rivers, estuaries, and streams.

What You Should Know: Dolphins typically live in groups called pods, consisting of around 10 individuals. The two main groups, marine dolphins and oceanic dolphins, include most known species. For instance, bottlenose dolphins are found in warm and temperate seas and oceans worldwide, avoiding the Arctic and Antarctic regions. Other species prefer temperate seas, like the listed dolphins or gray dolphins, which inhabit deeper areas with canyons and slopes. Killer whales, on the other hand, are found in colder regions far from the equator. A unique third group includes freshwater dolphins living in rivers and estuaries. However, this is not common in all rivers, though they are often found in regions like the Ganges in India and the Amazon in South America.

Tell Your Child: When dolphins are born, or during their early life stages, they are nourished by their mother's milk. As they grow into adulthood, their diet becomes more diverse. Being carnivorous, they feed on smaller fish like cod, herring, or mackerel, while some species prefer squid, mollusks, and crustaceans.

What You Should Know: Dolphin milk is rich in fats, nutrients, and proteins essential for the growth and development of calves. Once they mature, they leave their mothers and begin hunting for their own food. Their prey choices depend largely on the oceanic region they inhabit, though this can vary by species.

Typically, a dolphin consumes food equivalent to 10% of its body weight daily. For instance, a dolphin weighing 200 kg would need around 20 kg of fish per day, while larger species like killer whales require approximately 500 kg of meat daily.

Tell Your Child: Unlike other marine creatures, dolphins are highly intelligent. Scientific studies show that dolphins communicate within their pods by producing pulses and whistles.

What You Should Know: Previously, scientists discovered that dolphins use over 1,000 distinct whistles depending on their social context, but it was unclear if they could communicate one-on-one. In 2007, Australian scientists identified specific whistles, translating them to mean "I am here, where is everyone?", "Hurry up," and "There is food here." Dr. Ryabov believes these findings will motivate humans to further develop relationships and improve communication with these creatures.

Tell Your Child: While the average lifespan of a dolphin is around 17 years, some dolphins have been known to live up to 50 years.

What You Should Know: Although not migratory, dolphins move to areas with abundant food and suitable climates that match their body temperature. This explains why some dolphins can live up to 50 years, far exceeding the average lifespan of 17 years.

Tell Your Child: The largest dolphin species is the killer whale, also known as the orca. These dolphins have a remarkably long lifespan, averaging around 50 years.

What You Should Know: Killer whales, or orcas, are the largest members of the oceanic dolphin family. They live in pods consisting of multiple generations. Orcas have a rounded, streamlined body with a distinct black and white coloration. Their mouths are square-shaped, with the upper jaw longer than the lower. Their eyes are small, with white patches behind them. They possess a large, prominent dorsal fin that is glossy black.
Killer whales measure between 6 to 8 meters in length and weigh over 6 tons, with females typically weighing 3 to 4 tons. Their average lifespan is around 50 years. Orcas have exceptional vision and hearing, and they are considered one of the most intelligent dolphin species. They are also commonly trained for performances in aquatic shows.

Tell Your Child: Dolphins are marine mammals that live in the ocean. They are incredibly friendly and adorable creatures, known for their close relationship with humans. The English name for dolphins is 'Dolphin,' and they are distantly related to whales. This term refers to nearly 40 different dolphin species.

What You Should Know: Dolphins are marine mammals closely related to whales, inhabiting oceans and rivers. Nearly 40 species of dolphins, belonging to 17 genera, live in oceans, while a few reside in rivers like the Yangtze, Amazon, Indus, and Ganges. Dolphins vary in size from 1.2 meters (4 feet) and 40 kilograms (90 pounds) for the Maui dolphin, to 9.5 meters (30 feet) and 10 tons for the orca, also known as the killer whale.

Dolphins are found worldwide, often inhabiting shallow seas along continental shelves. They are carnivorous, primarily feeding on fish and squid. The oceanic dolphin family, Delphinidae, is the largest and most recently evolved family, appearing around 10 million years ago during the Miocene epoch. Dolphins are among the most intelligent animals and are widely recognized in human culture for their friendly nature and playful behavior.

Tell Your Child: Dolphins are easily recognizable as marine creatures, but they are much larger than most fish you might know. Their bodies are streamlined, tapering smoothly toward the tail, allowing them to swim at high speeds. Unlike other fish, dolphins breathe through lungs because they evolved from land-dwelling mammals.

What You Should Know: Dolphins have large, spindle-shaped bodies that taper evenly to the tail, enabling them to swim swiftly. The smallest dolphins measure around 1.2 meters, while the largest can reach up to 9.5 meters. Their weight ranges from 40 kilograms to 10 tons. Dolphins lack external ears and have small heads and skulls. Their eyes are level with the corners of their mouths, and they have long, pointed snouts. Their teeth are conical, aiding in hunting. Dolphins have a large, boneless dorsal fin, two paddle-like pectoral fins, and a large, deeply notched tail fin.

Tell Your Child: Dolphins are mammals, so they give birth to live young and nurse them with milk, just like other land-dwelling mammals.

What You Should Know: Dolphins reproduce by giving birth and nursing their young. Their reproductive organs are internal, with genital slits located on their underside. How do dolphins feed their young? They typically give birth to one calf after a gestation period of about one year. After birth, the mother nurses the calf through mammary glands, caring for it for approximately 11 months before separation.