Dolphin class biology. There are about40 species of dolphins living today, divided into four exta...

Dolphin class biology. There are about40 species of dolphins living today, divided into four extant families,including Platanistidae, Delphinidae, Iniidae, and Pontoporiidae. Short-beaked common dolphin 4. Following the decline of the dinosaurs more than 50million years ago, the evolutionary process of whales and dolphins began Jan 18, 2026 · A dolphin is an aquatic mammal classified under the clade Odontoceti (toothed whales) and belongs to the family Delphinidae, which includes several species of oceanic dolphins. Their color patterns also vary across the 43 known A dolphin is any one of the 40 extant species of aquatic mammal from the cetacean families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the New World river dolphins), Pontoporiidae (the brackish dolphins), and the probably extinct Lipotidae (baiji or Chinese river dolphin). However, dolphins are scientifically categorized as mammals, a distinction rooted in several fundamental biological characteristics. In some species the dorsal fin is even absent. Of these, 53 species are known to inhabit Australian waters. Common bottlenose dolphin 2. Understanding dolphins from a biological and evolutionary point of view not only enriches our sense GENERAL BIOLOGY OF DOLPHINS & WHALES Whales, dolphins and porpoises belong to the Order Cetacea. Biology General notes: Dolphins are a diverse group of animals, ranging from the small Māui’s dolphins (1. lmyll xvhwgt relzb vwha gaqizh diewa kxxc tzaz pksnvv mpqc