Seal

Cosma Home > Communication > Knowledge > Realm > Terrestrial > Sphere > Life > Animal > Seal

Spotlight

Note: These are 360° videos — press and hold to explore them!



Related

Pages

Terrestrial (Earth)
Sphere Land, Ice, Water (Ocean), Air, Life (Cell, Gene, Microscope)
Ecosystem Forest, Grassland, Desert, Arctic, Aquatic

Tree of Life
Microorganism
Plant Flower, Tree
Animal
Invertebrate Octopus, Ant, Bee, Butterfly, Spider, Lobster
Vertebrate Fish, Seahorse, Ray, Shark, Frog, Turtle, Tortoise, Dinosaur
Bird, Ostrich, Owl, Crow, Parrot
Mammal Bat, Rabbit, Giraffe, Camel, Horse, Elephant, Mammoth
Whale, Dolphin, Walrus, Seal, Polar Bear, Bear, Cat, Tiger, Lion, Dog, Wolf
Monkey, Chimpanzee, Human

Resources

These are organized by a classification scheme developed exclusively for Cosma. More…

General

Dictionary

seal : any of numerous carnivorous marine mammals (families Phocidae and Otariidae) that live chiefly in cold regions and have limbs modified into webbed flippers adapted primarily to swimming — Webster

OneLook, Free Dictionary, Wiktionary, Urban Dictionary

Encyclopedia

Seals, scientifically known as Pinnipeds, are a widely distributed and diverse clade of carnivorous, fin-footed, semiaquatic marine mammals. They comprise the extant families Odobenidae (whose only living member is the walrus), Otariidae (the eared seals: sea lions and fur seals), and Phocidae (the earless seals, or true seals). There are 33 extant species of pinnipeds, and more than 50 extinct species have been described from fossils. While seals were historically thought to have descended from two ancestral lines, molecular evidence supports them as a monophyletic lineage (descended from one ancestral line). Pinnipeds belong to the order Carnivora and their closest living relatives are bears and musteloids (weasels, raccoons, skunks, and red pandas), having diverged about 50 million years ago.

Seals range in size from the 1 m (3 ft 3 in) and 45 kg (99 lb) Baikal seal to the 5 m (16 ft) and 3,200 kg (7,100 lb) southern elephant seal, which is also the largest member of the order Carnivora. Several species exhibit sexual dimorphism. They have streamlined bodies and four limbs that are modified into flippers. Though not as fast in the water as dolphins, seals are more flexible and agile. Otariids use their front limbs primarily to propel themselves through the water, while phocids and walruses use their hind limbs. Otariids and walruses have hind limbs that can be pulled under the body and used as legs on land. By comparison, terrestrial locomotion by phocids is more cumbersome. Otariids have visible external ears, while phocids and walruses lack these. Pinnipeds have well-developed senses—their eyesight and hearing are adapted for both air and water, and they have an advanced tactile system in their whiskers or vibrissae. Some species are well adapted for diving to great depths. They have a layer of fat, or blubber, under the skin to keep warm in the cold water, and, other than the walrus, all species are covered in fur.

Although pinnipeds are widespread, most species prefer the colder waters of the Northern and Southern Hemispheres. They spend most of their lives in the water, but come ashore to mate, give birth, molt or escape from predators, such as sharks and killer whales. They feed largely on fish and marine invertebrates; but a few, like the leopard seal, feed on large vertebrates, such as penguins and other seals. Walruses are specialized for feeding on bottom-dwelling mollusks. Male pinnipeds typically mate with more than one female (polygyny), although the degree of polygyny varies with the species. The males of land-breeding species tend to mate with a greater number of females than those of ice breeding species. Male pinniped strategies for reproductive success vary between defending females, defending territories that attract females and performing ritual displays or lek mating. Pups are typically born in the spring and summer months and females bear almost all the responsibility for raising them. Mothers of some species fast and nurse their young for a relatively short period of time while others take foraging trips at sea between nursing bouts. Seals produce a number of vocalizations, notably the barks of California sea lions and the complex songs of Weddell seals. — Wikipedia

Encyclopædia Britannica

Search

WolframAlpha

Preservation

Library

WorldCat, Library of Congress, UPenn Online Books, Open Library

Participation

Education


Course

OER Commons: Open Educational Resources

Community

News

Phys.org, NPR Archives

Book

ISBNdb

Government

Document

USA.gov

Expression

Fun



Seal slaps kayaker with octopus in viral GoPro video (Caitlin O ‘Kane, CBS NEWS)
Why Did An Octopus-Wielding Seal Slap A Kayaker In The Face? (Rachel D. Cohen, NPR)

Arts

Poem

OEDILF: The Omnificent English Dictionary In Limerick Form

returntotop

More…

Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • Researchers build cannon to test seals in coal...
    on August 15, 2019 at 12:33 pm

    Mining and explosives engineering researchers at Missouri S&T began testing concrete seals used to close coal mine tunnels this month by loading a cannon with projectiles, shooting them at the seals and testing their impact. The research could help to improve the design of seals and keep miners safe.

  • A society's cultural practices shape the...
    on August 14, 2019 at 8:10 pm

    It's unlikely that someone born today could independently think up all the necessary steps it would take to send a rocket to the moon. They would need to learn from those who came before them.

  • Removing old structures from rivers could restore...
    on August 14, 2019 at 12:10 pm

    Rivers in Europe are so congested with concrete obstructions like weirs, bridges and other man-made barriers that they no longer flow freely, which harms the wider environment. Removing these blockages could restore these vital aquatic ecosystems to their former glory.

  • Arctic Ocean could have no September sea ice if...
    on August 13, 2019 at 8:30 pm

    Arctic sea ice could disappear completely through September each summer if average global temperatures increase by as little as 2 degrees, according to a new study by the University of Cincinnati.

  • New technique can show link between prey and...
    on August 13, 2019 at 1:17 pm

    Scientists have developed a new method to investigate links between top predator diets and the amount of microplastic they consume through their prey.