Agriculture
Hungry bug seeks hot meal
Earth-Friendly Fabrics
Protecting Cows—and People—from a Deadly Disease
Amphibians
Toads
Newts
Poison Dart Frogs
Animals
The History of Meow
Lives of a Mole Rat
Ant Invasions Change the Rules
Behavior
Wake Up, Sleepy Gene
Wired for Math
Swine flu goes global
Birds
Rheas
Chicken
Vultures
Chemistry and Materials
Undercover Detectives
Supergoo to the rescue
The chemistry of sleeplessness
Computers
Seen on the Science Fair Scene
It's a Small E-mail World After All
Hubble trouble doubled
Dinosaurs and Fossils
A Really Big (but Extinct) Rodent
Fossil Forests
Dino Takeout for Mammals
E Learning Jamaica
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
2014 GSAT Results for Jamaican Kids
Earth
Coral Gardens
Hints of Life in Ancient Lava
Flower family knows its roots
Environment
Shrinking Fish
Spotty Survival
Will Climate Change Depose Monarchs?
Finding the Past
Your inner Neandertal
Traces of Ancient Campfires
An Ancient Childhood
Fish
Seahorses
Swordfish
Codfish
Food and Nutrition
Allergies: From Bee Stings to Peanuts
Recipe for Health
Sponges' secret weapon
GSAT English Rules
Adjectives and Adverbs
Pronouns
Order of Adjectives
GSAT Exam Preparation Jamaica
GSAT Scholarship
Ministry of Education Announces 82 GSAT Scholarships for 2010
Mastering The GSAT Exam
GSAT Exams Jamaica Scholarships
GSAT Practice Papers | GSAT Mathematics | Maths
42,000 students will sit for the GSAT Exam in two weeks
2014 GSAT Results for Jamaican Kids
GSAT Mathematics
Math of the World
GSAT Mathematics Quiz, Teaching Math, teaching anxiety
It's a Math World for Animals
Human Body
Smiles Turn Away Colds
Spit Power
Foul Play?
Invertebrates
Cockroaches
Giant Clam
Camel Spiders
Mammals
Coyotes
Capybaras
African Mammals
Parents
Choosing a Preschool: What to Consider
Raise a Lifelong Reader by Reading Aloud
The Surprising Meaning and Benefits of Nursery Rhymes
Physics
Black Hole Journey
Thinner Air, Less Splatter
The Mirror Universe of Antimatter
Plants
Fastest Plant on Earth
City Trees Beat Country Trees
Nature's Alphabet
Reptiles
Anacondas
Reptiles
Garter Snakes
Space and Astronomy
Pluto, plutoid: What's in a name?
Super Star Cluster in the Neighborhood
The two faces of Mars
Technology and Engineering
Sugar Power for Cell Phones
Smart Windows
Bionic Bacteria
The Parts of Speech
Adjectives and Adverbs
What is a Verb?
What is a Noun
Transportation
Morphing a Wing to Save Fuel
Are Propellers Fin-ished?
Seen on the Science Fair Scene
Weather
In Antarctica watch the heat (and your step)
Weekend Weather Really Is Different
Arctic Melt
Add your Article

Aquatic Animals

A marine mammal is a mammal that is primarily ocean-dwelling or depends on the ocean for its food. Mammals originally evolved on land, but later marine mammals evolved to live back in the ocean. There are five groups of marine mammals: 1. Order Sirenia: the manatee, dugong, and sea cow 2. Order Carnivora, family Ursidae: the polar bear 3. Order Carnivora, infrafamily Pinnipedia: the seal, sea lion, and walrus 4. Order Carnivora, family Mustelidae: the Sea Otter and Marine Otter 5. Order Cetacea: the whale, dolphin, and porpoise Since different groups of marine mammals originate from different ancestors, this is a case of convergent evolution. Since mammals originally evolved on land, their spines are optimized for running, allowing for up-and-down but only little sideways motion. Therefore, marine mammals typically swim by moving their spine up and down. By contrast, fish normally swim by moving their spine sideways. For this reason, fish mostly have vertical caudal (tail) fins, while marine mammals have horizontal caudal fins. Some of the primary differences between marine mammals and other marine life are: Marine mammals breathe air, while most other marine animals extract oxygen from water. Marine mammals have hair. Cetaceans have little or no hair, usually a very few bristles retained around the head or mouth. All members of the Carnivora have a coat of fur or hair, but it is far thicker and more important for thermoregulation in Sea Otters and Polar Bears than in seals or sea lions. Thick layers of fur contribute to drag while swimming, and slow down a swimming mammal, giving it a disadvantage in speed. Marine mammals have thick layers of blubber used to insulate their bodies and prevent heat loss. Sea Otters and Polar Bears are exceptions, relying more on fur and behavior to stave off hypothermia. Marine mammals give live birth. Most marine mammals only give birth to one calf or pup at a time, and are never able to birth twins or larger litters. Marine mammals feed off milk as young. Maternal care is extremely important to the survival of offspring that need to develop a thick insulating layer of blubber. The milk from the mammary glands of marine mammals often exceeds 40-50% fat content to support the development of blubber in the young. Marine mammals maintain a high internal body temperature. Unlike most other marine life, marine mammals carefully maintain a core temperature much higher than their environment. Blubber, thick coats of fur, blubbles of air between skin and water, countercurrent exchange, and behaviors such as hauling out, are all adaptations that aid marine mammals in retention of body heat. The polar bear spends a large proportion of its time in a marine environment, albeit a frozen one. When it does swim in the open sea it is extremely proficient and has been shown to cover 74 km in a day. For these reasons, some scientists regard it as a marine mammal.

Aquatic Animals
Aquatic Animals








Designed and Powered by HBJamaica.com™