Are Dolphins Mammals? Explained Clearly in One Article
Dolphins are large carnivores at the top of the food chain. Apart from the more ferocious sharks, other marine creatures basically pose no threat to them. They mainly inhabit warm tropical waters, but some, such as the right whale dolphin, prefer colder waters. They usually live in shallow water or at least stay near the surface. Let's take a look below at whether dolphins are mammals!
Are Dolphins Mammals?
Dolphins are aquatic mammals closely related to whales and porpoises. They evolved during the Miocene about 10 million years ago and are widely found in shallow seas near continental shelves, occasionally in freshwater, feeding mainly on fish and mollusks. The various dolphins make up the family Delphinidae, which is the most species-rich family among marine mammals, with 17 genera and 37 species worldwide, and 13 genera and 18 species in China. Dolphins have a friendly-looking appearance and a playful nature, and have always been very popular in human culture.
What Do Dolphins Eat?
Dolphins feed mainly on fish and squid, among which killer whales also prey on mammals (such as whales and pinnipeds) as well as birds and large fish. Like other toothed whales, dolphins rely on echolocation to hunt, and can even stun prey with high-intensity sound. Some dolphins are highly social species, living in large groups (sometimes made up of more than 100,000 individuals), showing many interesting collective behaviors. Members within a group cooperate in various ways; one example is that pods of dolphins sometimes attack sharks, killing them by ramming, and members also cooperate to rescue injured or sick individuals.
Where Are River Dolphins Distributed?
1. Amazon river dolphin: The Amazon river dolphin, also known as the Amazon freshwater dolphin, pink river dolphin, pink freshwater dolphin, etc., is a species unique to the Amazon and Orinoco river basins and is the largest freshwater dolphin.
2. Baiji: The baiji, also known as the white-fin whale, white-fin, Yangtze river dolphin, etc., is a freshwater cetacean unique to China, found only in the middle and lower reaches of the Yangtze River. It is a national first-class protected wild animal and one of the 12 most endangered animals in the world.
3. Ganges river dolphin: The Ganges river dolphin is a freshwater dolphin living in India, Bangladesh, Nepal and Pakistan, divided into the Indus subspecies and the Ganges subspecies. Only about 2,000 to 6,000 remain worldwide.
4. La Plata dolphin: The La Plata dolphin is the only species that lives in rivers, also known as the La Plata river dolphin, La Plata dolphin, etc. It is a freshwater dolphin that lives in the ocean, distributed in the southeastern part of South America and the Atlantic Ocean.