: any of an order or suborder (Pinnipedia) of aquatic carnivorous mammals (such as a seal or walrus) with all four limbs modified into flippers.
Porpoises are a group of fully aquatic marine mammals, similar in appearance to a dolphin, all of which are classified under the family Phocoenidae, parvorder Odontoceti (toothed whales). There are seven extant species of porpoise, all among the smallest of the toothed whales.
Dolphins and porpoises differ in their faces, fins, and body shapes. Dolphins have longer noses, bigger mouths, more curved dorsal fins, and longer, leaner bodies than porpoises. The harbor porpoise has small pointed flippers and no beak. The dorsal fin is small and triangle-shaped.
I.General Characteristics
- Fusiform-shaped body.
- Large body size.
- Virtually hairless.
- Blubber.
- No sebaceous glands.
- Tails flattened dorso-ventrally into flukes.
- Forelimbs are modified into flippers.
- Vestigial hindlimbs.
Questions 1-7
| SENSE | SPECIES | COMMENTS |
|---|
| Smell | baleen | related brain structures are present |
| Taste | some types | nerves linked to their 1 are underdeveloped Answer: taste buds Locate |
| Touch | all | region around the blowhole very sensitive |
| Vision | 2 Answer: baleen/the baleen whales Locate | probably do not have stereoscopic vision |
Manatees belong to the family, Trichechidae, of the Mammalian Order Sirenia. Despite the manatee's aquatic appearance, it is not closely related to whales, dolphins, seals, or sea lions. In fact, their closest relatives are elephants and hyraxes. Like elephants and hyraxes, they are herbivorous.
Carnivora (n.)order of meat-eating mammals, 1830, from Latin (animalia) carnivora "flesh-eating (animals)," neuter plural of carnivorus "flesh-eating" (see carnivorous).
Cetacean, (order Cetacea), any member of an entirely aquatic group of mammals commonly known as whales, dolphins, and porpoises.
Oscitation: The act of yawning, the involuntary opening of the mouth with respiration, breathing first inward, then outward. Yawning is often caused by suggestion. Repeated yawning is commonly a sign of drowsiness. It can also sometimes be a sign of depression.
Is Cetacea an order?
Even-toed ungulates
Therapsid
Despite what dolphinaria may have you believe, dolphins are apex ocean predators, capable of even killing sharks, and should be treated as such. Dolphins can be aggressive to people, other dolphins, or even self-harm.
Whales (Cetacean) are divided into two group's baleen whales (Mysticeti) toothed whales (Odontoceti). The main difference between them is that baleen whales have baleen and two blow holes while toothed whales have teeth and one blow hole.
First thing's first: all dolphins are whales, but not all whales are dolphins. That's because the Cetacean order of sea animals encompasses dolphins, porpoises and what we think of as whales.
The Cetacea are one of the most distinctive and highly specialized orders of mammals. They include the largest animal that has ever lived, the blue whale; the highly intelligent and communicative dolphins; the tusked narwhals and blind river dolphins and singing humpback whales — nearly eighty living species in all.
Are dolphins smarter than humans? Current tests for intelligence indicate that dolphins do not possess the same cognitive abilities as humans and are thus not the "smarter" species. Like humans, dolphins possess the ability to beneficially alter their surroundings, solve problems, and form complex social groups.
There are over 80 recognized species of cetaceans, including both freshwater and saltwater natives. These species are divided into two main groups: the baleen whales and the toothed whales. While they are all considered whales, there are some important differences between the two types.
According to molecular evidence, the closest living relatives of whales are, quite surprisingly, the artiodactyls, a group of hoofed mammals that includes deer, cows, sheep, pigs, giraffes, camels and hippos.
There are two types of whales: toothed and baleen. Toothed whales, as the name suggests, have teeth, which are used to hunt and eat squid, fish, and seals. Toothed whales include sperm whales, as well as dolphins, porpoises, and orcas, among others.
The Cetacea (whales, dolphins and porpoises) currently include 86 species that inhabit the world's oceans, lakes and rivers. Some are cosmopolitan, occurring in marine waters from pole to pole, while others are restricted by ecology and population status to small ranges of a few thousand square kilometers or less.
What order are whales in?
Even-toed ungulates
Therapsid
Orcas can grow to be up to about 32 feet long, while the largest of the baleen whales (the blue whale), can reach a whopping 100 feet. Today, if a dolphin reaches a size of more than 30 feet long, it may be referred to by some as a whale, but the rules of taxonomy still classify the orca as a dolphin.
The sperm whale belongs to the order Cetartiodactyla, the order containing all cetaceans and even-toed ungulates. It is a member of the unranked clade Cetacea, with all the whales, dolphins, and porpoises, and further classified into Odontoceti, containing all the toothed whales and dolphins.
