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sciencing.com/characteristics-dolphins-8394898.html

Dolphins form strong bonds with other dolphins, and if one dolphin become injured, the others help it to reach the surface. Most dolphins stay in groups of up to 12 dolphins, but many groups often come together in the ocean wild, at which time, dolphins may exit one group and join another.

factsanddetails.com/world/cat53/sub342/item1238.html

Dolphin Characteristics . Dolphins have lived to be 55 in captivity and are believed to live around the age of 30 in the wild. The distinct dolphin "smile" is a manifestation of the natural curve of the animal’s jawline not a friendly disposition. It is the result of a flared jawbone, which serves as an ultra-sensitive ear.

www.thoughtco.com/facts-about-dolphins-129800

Dolphins (Odontoceti) are a group of 44 species of toothed whales or cetaceans.There are dolphins in every ocean on Earth, and there are freshwater species of dolphins that inhabit rivers in South Asian and South American. The largest dolphin species (the orca) grows to more than 30 feet long while the smallest, Hector's dolphin, is just 4.5 feet in length.

animals.mom.me/traits-dolphin-7192.html

Around 50 million years ago, relatives of modern day dolphins first entered the seas. Today, these aquatic mammals -- who are part of the order Cetacean -- can be found in oceans all across the globe, and even occasionally in rivers. Although there are 36 different species of dolphin, they all have certain traits in ...

www.dolphins-world.com/dolphin-behavior

Research on dolphin intelligence provides valuable information that reveals the reasons for their particular behavior. These cetaceans can perform unusual activities within the animal world and perform complex actions. Most dolphins are active during the 24 hours, both day and night although they are mainly active during the morning and afternoon.

en.wikipedia.org/wiki/Dolphin

Dolphin is a common name of aquatic mammals within the infraorder Cetacea.The term dolphin usually refers to the extant families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the New World river dolphins), and Pontoporiidae (the brackish dolphins), and the extinct Lipotidae (baiji or Chinese river dolphin). There are 40 extant species named as dolphins.

kids.britannica.com/students/article/dolphin/274033

The largest species in the dolphin family, the killer whale, can reach more than 32.5 feet (10 meters) and weigh about 10 metric tons (9,800 kilograms). However, most dolphins are much smaller. For example, bottlenose dolphins reach an average length of 8–10 feet (2.5–3 meters) and weight of 300–650 pounds (135–300 kilograms).

www.thoughtco.com/cetaceans-whales-dolphins-and-porpoises-2291928

Cetacean is a word used to describe all whales, dolphins, and porpoises. Learn of the characteristics of cetaceans and how they survive in the ocean.

defenders.org/wildlife/dolphins

Dolphins are highly intelligent marine mammals and are part of the family of toothed whales that includes orcas and pilot whales. They are found worldwide, mostly in shallow seas of the continental shelves, and are carnivores, mostly eating fish and squid. Dolphin coloration varies, but they are generally gray in color with darker backs than the rest of their bodies.

www.thoughtco.com/delphinidae-definition-2291705

Characteristics of Delphinidae The Delphinidae are generally fast, streamlined animals with a pronounced beak, or rostrum . Dolphins have cone-shaped teeth, an important characteristic that distinguishes them from porpoises .